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Region at the back of the eye where the retina meets the optic nerve is

Chapter 17 Sense Organs Flashcards Quizle

  1. Region at the back of the eye where the optic nerve meets the retina: Macula. Yellowish region in the retina; contains the fovea centralis: Iris. Pigmented layer that opens and closes to allow more or less light into the eye: Cornea
  2. optic disc Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light
  3. An area where the sclera gives way to the cornea
  4. optic disc Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, and no rods or cones
  5. The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused,..

optic chiasm (chiasm means crossing). Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light optic nerve region at the back of the eye where the optic nerve meets the retina optic disc yellowish region on the retina lateral to and slightly below he optic disc, contains the fovea centralis the ear of clearest and central vision macula abnormally large ear Layer containing blood vessels that lines the back of the eye and is located between the retina (the inner light-sensitive layer) and the sclera (the outer white eye wall)

The blind spot is the location on the retina known as the optic disc, where the optic nerve fibre exit the back of the eye. Because there are no cones or rods at this point on the retina, there is a very small gap in the visual field. The blind spot is the area on the retina without receptors, that respond to light The optic disc or nerve head is the point where the axons from the retinal ganglion cells leave the eye. The nerve head appears as a white circular structure in the back of the eye. There are no photoreceptors on this structure. As a result, humans have a natural blind spot. 1 ï» region at the back of the eye where the retina meets the optic nerve is: optic disc: the normal adjustment of the lens to bring an object into focus is: accommodation: a yellowish region on the retina lateral to the optic disc is: macula: bending of light rays by the cornea, lens, and fluids of the eye is : refractio The retina is a light-sensitive layer at the back of the eye that covers about 65 percent of its interior surface. Photosensitive cells called rods and conesin the retina convert incident light energy into signals that are carried to the brain by the optic nerve. In the middle of the retina is a small dimple called the foveaor fovea centralis

The blind spot is the area on the retina without receptors that respond to light. Therefore an image that falls on this region will not be seen. It is in this region that the optic nerve exits the eye on its way to the brain Answer: Two forms of calcium build-up on the optic nerve (back of eye) that can create problems include optic disk drusen (yellow, fatty deposits under retina), as you mentioned, and calcification within an optic nerve sheath meningioma. Drusen are the most common findings and involve protein and calcium deposits that mimic optic nerve swelling optic chiasm 17 region at the back of the eye where the optic nerve meets the retina

Ch 34 Special Senses Flashcards Quizle

Blind spot is the part where the optic nerve passes out of the retina. Photoreceptors are absent in this region. Blind spot is a small portion of the visual field of each eye that corresponds to the position of the optic disc (also known as the optic nerve head) within the retina Intraocular part of the CN II. The optic nerve head is the most anterior component of the optic nerve and corresponds to the 1 mm segment that is located within the eyeball (i.e. the intraocular part). Historically, it was thought to be a raised entity protruding from the retinal surface and by extension, was referred to as a papilla (hence the term, papilloedema) Optic disc: the visible (when the eye is examined) portion of the optic nerve, also found on the retina. The optic disc identifies the start of the optic nerve where messages from cone and rod cells leave the eye via nerve fibres to the optic centre of the brain. This area is also known as the 'blind spot' No more than 1 mm long, the lamina straddles the light-sensitive retina at the back of the eye and the optic nerve that extends to the brain to produce vision. The lamina is a transition zone, through which the axons of neurons called retinal ganglion cells pass. The axons extend from the eye and bind together to form the optic nerve

Language of Medicine: Ch 17, Pt 2 Flashcards Quizle

Retina Function, Anatomy & Anatomy Body Map

The optic nerve projects to the brain from the back of the eye, carrying information from the retinal cells. Where the optic nerve leaves, there are no photoreceptors since the axons from the neurons are coming together. This region is called the optic disc and is the location of the blind spot in our visual field. Figure 19.1 The optic nerve is composed of retinal ganglion cell axons and glial cells.Each human optic nerve contains between 770,000 and 1.7 million nerve fibers, which are axons of the retinal ganglion cells of one retina. In the fovea, which has high acuity, these ganglion cells connect to as few as 5 photoreceptor cells; in other areas of retina, they connect to many thousand photoreceptors The optic nerve lamina region (ONLR) transitions between the eye and optic nerve (ON) and is the primary damage site in the age-related disease open angle glaucoma (OAG). The ONLR inhibits intraocular myelination and enables postnatal ON myelination of growing retinal ganglion cell axons. We show that the ONLR contains an adult neural progenitor cell (NPC) niche capable of generating all. The optic nerve from each eye carries impulses to the brain, where visual information is interpreted. Damage to an optic nerve or damage to its pathways to the brain results in loss of vision. At a structure in the brain called the optic chiasm, each optic nerve splits, and half of its fibers cross over to the other side region at the back of the eye where the optic nerve meets the retina. IT'S THE BLIND SPOT OF THE EYE BECAUSE IT CONTAINS ONLY NERVE FIBERS, NO RODS OR CONES, AND IS THUS INSENSITIVE TO LIGHT. Ter

Flashcards - Medical Terminology Ch 1

macula Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the area of clearest vision. optic chiasm Point at which optic nerve fibers cross in the brain (Latin chiasma means crossing). optic disc Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve. Region at the back of the eye where the optic nerve meets the retina: optic disc: Yellowish region in the retina; contains the fovea centralis: macula: Light-sensitive nerve cell layer of the eye containing photoreceptor cells: retina: Central opening of the eye, surrounded by the iris, through which light rays pass: pupi The retina is, as mentioned, the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain. The macula is a small area in the retina that contains special light-sensitive cells and allows us to see fine details clearly. The vitreous humor is a clear, jelly-like substance that. Retinal nerve fibers exit the eye through the optic nerve, located nasally and on the same plane as the anatomical center of the retina. There is no retinal tissue overlying the optic nerve head. The optic nerve head or optic disc is oval in shape and measures approximately 1.75 mm. vertically and 1.5 mm horizontally macula Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the area of clearest vision. optic chiasm Point at which optic nerve fibers cross in the brain (Latin chiasma means crossing). optic disc Region at the back of the eye where the optic nerve meets the retina. It is the blind.

The optic nerve is a bundle of fibers that transmits visual information between the retina and the brain. The area where the optic nerve enters the back of the eyeball is known as the optic disc The optic nerve is composed of over one-million individual nerve fibers/axons. Since the axons of nerves cannot be measured accurately in a live eye, indirect measures of axons (axon counting) must be used. Optical coherence tomography (OCT), the GDx Analyzer (short for Glaucoma Diagnosis Analyzer), and Heidelberg Retinal Tomography (HRT. The axons of the retina's ganglion cells collect in a bundle at the optic disc and emerge from the back of of the eye to form the optic nerve. The optic nerve is the pathway that carries the nerve impulses from each eye to the various structures in the brain that analyze these visual signals

Flashcards - Chapter 17

Less than 1 millimeter wide, the lamina lies between the light-sensitive retina tissue at the back of the eye and the optic nerve. The long nerve cell fibers extend from the retina through the. Most of the retina is not attached to the eye. Instead, it is held in place by fluids in the eye. The tissue of the retina gathers at the back of the eye where it forms into the optic nerve. This is the only place where the retina is attached to the eye. Use a pair of tweezers to gently lift the retina off the inside wall of the eye

colored portion of the eye; surrounds the pupil: iris: tough, white outer coat of the eyeball: sclera: region at the back of the eye where the retina meets the optic nerve: optic disc: a yellowish region on the retina lateral to the optic disc: macula: Bending of light rays by the conea, lens, and fluids in the eye: refraction: Inflammation of. The central retinal artery first enters the optic nerve approximately 0.8-1.5 cm behind the globe. II. The optic nerve is approximately 30 mm long, longer than the distance from the back of the eye to the optic canal, and so takes a somewhat sinuous course through the posterior orbit Intrabulbar - inflammation affects the optic disc and originates in the intraocular region, located between the ethmoid plate of the sclera and the level of the retina. In the case when the layer of retinal nerve fibers is additionally affected, neuroretinitis is diagnosed - a type of optical neuropathy. (2 The optic nerve is the nerve that transmits visual information from the retina to the brain.Also known as the second cranial nerve, it is a purely sensory nerve consisting of about 1.2 million nerve fibers. This is much less than the 130 million or so photoreceptor cells in the retina and indicates that quite a lot of preprocessing takes place before signals are sent along the optic nerve to. The starting point of this nerve is the optic disk, which is a structure of 1.5 mm length. The optic disk is created from the gathering of ganglion cell output fibers known as axons, which pass out through the eye. When the optic nerve reaches the back of the eye, it passes through the remaining part of the posterior orbit known as the eye socket

The blind spot is the point in the eye where the optic nerve exits the eye, meaning the answer is d).The retina is made up of photoreceptor cells, which can detect light. The optic nerve, which. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light. Macula: Yellow region on the retina lateral to and slightly below the optic disk. Fovea centralis: Tiny pit of depression in the retina that is the region of clearest vision. Fundus: Posterior, inner part of the eye Figure 1. The cornea and lens of an eye act together to form a real image on the light-sensing retina, which has its densest concentration of receptors in the fovea and a blind spot over the optic nerve. The power of the lens of an eye is adjustable to provide an image on the retina for varying object distances To make the research discovery, Dr. Bernstein and his team examined a narrow band of tissue called the optic nerve lamina. Less than 1 millimeter wide, the lamina lies between the light-sensitive retina tissue at the back of the eye and the optic nerve. The long nerve cell fibers extend from the retina through the lamina, into the optic nerve The right optic nerve appeared hyperintense on diffusion imaging and hypointense on the ADC map . The mean diffusion signal value was 315 in the right optic nerve and 133 in the left optic nerve. The mean ADC value was 1.84 × 10 −3 mm 2 /s on the right retina and 2.60 × 10 -3 mm 2 /s on the left retina

The peripheral retina has lower resolution and consists of mostly rods for black and white vision. This design is a highly effective method to accurately transmit enormous amounts of data along the optic nerve in a method analogous to the zipping and unzipping of a computer file to facilitate computer file transmission Optic nerve: The bundle of nerve fibers at the back of the eye that carry visual messages from the retina to the brain. Photoreceptors: The light sensing nerve cells (rods and cones) located in the retina. Pupil: The adjustable opening at the center of the iris through which light enters the eye. Retina: The light sensitive layer of tissue that. The optic nerve (CN II) is the second cranial nerve, responsible for transmitting the special sensory information for vision.. It is developed from the optic vesicle, an outpocketing of the forebrain.The optic nerve can therefore be considered part of the central nervous system, and examination of the nerve enables an assessment of intracranial health Since the mid-19th century, it has been recognized that changes in the optic nerve appearance correlate with vision and visual field loss in glaucoma. Although there have been variations in the definition of glaucoma over time, increased attention to the structure and appearance of the optic nerve has been a hallmark in understanding glaucoma

Anatomy of the Eye Kellogg Eye Center Michigan Medicin

  1. Nerve fibers from these cells join at the back of the eye to form the optic nerve. 4. The optic nerve of each eye meets the other at the optic chiasm. Medial nerves of each optic nerve cross, but lateral nerves stay on the same side. The overlap of nerve fibers allows for depth perception. 5. Electrical impulses are communicated to the visual.
  2. They will become enclosed within the optic nerve when the choroid fissure closed in week 7 of development. They are thereafter called the central retinal vessels, which enter the eye in the region of the optic disc. Optic nerve fibers, originating in the ganglion cells of the retina, travel back to the CNS in the inner layer of the optic stalk
  3. Nerve cells in the retina, known as retinal ganglion cells, extend their axons from the eye to the brain through the optic nerve in order to relay and process visual information
  4. Blind Spot - The region where the optic nerve leaves the eye. It does not contain any rods or cones, therefore is not sensitive to light. Optic Nerve - A nerve that transmits nerve impulses to the brain when the photoreceptors in the retina are stimulated. Retina - The innermost layer of the eyeball. It is the light-sensitive layer on which.
  5. Visual processing begins in the retina. Light energy produces chemical changes in the retina's light sensitive cells. These cells, in turn, produce electrical activity. Nerve fibers from these cells join at the back of the eye to form the optic nerve. The optic nerve of each eye meets the other at the optic chiasm

Where the optic nerve leaves the eye, the retina has no

What's That In My Retinal Photo? Hemorrhage at the Nerve

Optic Nerve: Anatomy, Location, and Functio

Free Flashcards about Chapter 17 - studystack

The Retina of the Human Eye - Georgia State Universit

In another region of the retina, there are no photoreceptors present meaning that this region of the retina cannot receive visual information forming a blind spot. This is where the optic nerve meets the retina. More specifically it is where ganglion cells send information to the brain. This is spot of the retina is called the optic disc let's examine the difference between rods and cones in our eyes let me draw a very simplified schematic of a rod just to give you an idea of what it looks like so rods actually get their name because if you look at a rod under a microscope it actually has this elongated cell body that kind of gives it a rod shape so around is a photoreceptor what exactly is a photoreceptor is it a neuron is it. •The retina lines the the posterior cavity of the eye and extends forward to the ciliary body. Use your probe to lift and pull the retina back from the underlying choroid layer. •Notice that the retina is only firmly attached to the choroid at one place. This region is the optic disc or blind spot

Light enters the eye stimulates the retina and relays visual information to the brain through nerve impulses . What is the contains sensitive cells called rods and cones that transform light energy into nerve impulses . what is the region at the back of the eye where the optic nerve meets the retina. op... Disclaimer Constanzo Varolio (1543-1575) of Bologna was the first to dissect the brain from below and to show in annotated detail the structure of the optic nerve in its relation to the central nervous. To examine the back of the eye, or retina, your ophthalmologist dilates your pupils with eye drops. With the pupil dilated, the doctor looks for any abnormalities in the shape or color of the optic nerve—a sign that it may be damaged—and the retina, including the macula. The macula is responsible for central vision The Retina and Optic Nerve Hypertensive retinopathy is damage to the retina (the transparent, light-sensitive structure at the back of the eye) caused by high blood pressure. When blood pressure is high (a condition called hypertension ), the retina may become damaged Optic nerve regions and damage levels. (A) Schematic showing the regions we defined as nerve fiber layer, pre-lamina, and lamina (not to scale). Axons (pink) course into the optic nerve head, pass out of the eye through the glial lamina (crosshatches, located within the scleral canal) and become myelinated behind the eye (horizontal lines)

The human eye is made up of various parts (continued) •Vitreous humor: The transparent fluid that fills the large chamber in the posterior part of the eye. •Retina: A light-sensitive membrane in the back of the eye that contains rods and cones. The lens focuses an image on the retina, which then sends signals to the brain through the optic. Optic nerve head drusen (ONHD) are globular, often calcified, hyaline bodies located within the optic nerve head. The incidence of ONHD is 3.4 per 1000 in clinical studies; however, a higher rate of 10 to 20 per 1000 has been reported in autopsy studies. Pedigree studies suggest that drusen of the optic disc is a hereditary anomaly most compatible with the theory of irregular dominance with. The visual pathway describes the anatomical pathway by which electrical signals generated by the retina are sent to the brain (Fig. 6).The nerve fibers of the retina, representing the axons of the ganglion cells, collect together at the optic disk before passing out of the eye through the orbital bones and into the brain via the optic nerve (the second cranial nerve)

The region of the vertebrate eye, where the optic nerve

The visual pathway consists of structures that carry visual information from the retina to the brain.Lesions in that pathway cause a variety of visual field defects. In the visual system of human eye, the visual information processed by retinal photoreceptor cells travel in the following way: Retina→Optic nerve→Optic chiasm (here the nasal visual field of both eyes cross over to the. When light reaches the retina in the eye and an image is created, it moves to the rest of the brain through the optic nerve. The optic nerve is the second cranial nerve, and is the connection between the brain and eyes. Damage to the optic nerve prevents any information from being sent from the eyes to the rest of the brain

This double layer is known as the pars ciliaris retinæ, and can be traced forward from the ciliary processes on to the back of the iris, where it is termed the pars iridica retinæ or uvea. The arteria centralis retinæ and its accompanying vein pierce the optic nerve, and enter the bulb of the eye through the porus opticus. The artery. The retina in-cludes both the sensory neurons that respond to light and intricate neural circuits that perform the first stages of image processing; ultimately, an elec-trical message travels down the optic nerve into the brain for further pro-cessing and visual perception. Intuitively, one might expect that the surface of the retina (the layer ex

Is there any cure for calcium build-up on optic nerve

Near the center of the optic nerve is the central retinal artery . What is its origin? Its distribution? How does the optic nerve enter the middle cranial fossa (#5435, #6934)? Follow the intracranial course of the ganglion cell axons by identifying, in order, the optic nerve , optic chiasm , and optic tract Eye problems can also occur when a brain tumor exerts pressure on the optic nerve or when pressure within the skull causes the back of the eye (optic disc) to swell (a condition known as papilledema). Finally, brain tumors that invade or push on any of the neural connections between the eyes and the occipital lobe can cause loss of parts. Optic nerve hypoplasia, which is an abnormally small optic nerve head. Megalopapilla, which presents as an enlarged optic nerve head with an increased cup-to-disc ratio and a hori­zontally elongated cup. Morning glory syndrome, which appears as a funnel-shaped excavation, an enlarged optic nerve head, and an increased number of disc vessels the structures visible in the posterior segment of the eye via an ophthalmoscope; includes the optic disc, the retina and retinal pigment epithelium, the choroid and, sometimes, the sclera; area of the fundus where the tapetum lucidum is visible is known as the tapetal fundus while the remainder is the non-tapetal fundu retina [ret´ĭ-nah] the innermost of the three tunics of the eye, surrounding the vitreous body and continuous posteriorly with the optic nerve. The retina is composed of light-sensitive neurons arranged in three layers; the first layer is made up of rods and cones and the other two transmit impulses from the rods and cones to the optic nerve. The rods.

The optic nerve, a bundle of over 1 million nerve fibers, is responsible for transmitting nerve signals from the eye to the brain. These nerve signals contain information for processing by the brain. The front surface of the optic nerve, which is visible on the retina, is called the optic disk or optic nerve head Polymersomes were found in the vitreous for at least 92 days post-dosing. Furthermore, fundus imaging revealed that the polymersomes accumulated near the optic nerve and retained there even at 111 days post-injection. Polymersomes represent a promising technology for controlled and site-specific drug delivery in the posterior eye segment The Visual Pathway The peripheral receptors for light are situated in the retina.Nerve fibres arising in the retina constitute the optic nerve.The right and left optic nerves join to form the optic chiasma in which many of their fibres cross to the opposite side.The uncrossed fibres of the optic nerve, along with the fibres that have crossed over from the opposite side form theoptic tract Cerebrospinal fluid pressure (CSFP) interacts with intraocular pressure (IOP) and blood pressure to exert a major influence upon the eye, particularly the optic nerve head region. There is increased interest regarding the influence of CSFP upon disorders affecting this region, in particular glaucoma and idiopathic intracranial hypertension. Additionally, a high proportion of astronauts develop. The retina is the clear, photosensitive tissue that lines the back of the eyeball. The retina processes and transforms light into nerve impulses that travel through the optic nerve to the brain where we interpret the impulses as vision

Chapter 17- Sense Organs: The Eye and The Ear Flashcards

Indeed the eye's retina and optic nerve are a part of the brain: during early development, a small part of the brain pouches out and becomes the retina and optic nerve. Inside the eye, a group of neurons called retinal ganglion cells collect all of the visual information and pass it down their extensions, called axons, through the optic nerve. Retinal Nerve Fiber Layer and Optic Nerve The first histological evidence for retinal abnormalities in AD was presented by Hinton et al. (1986) who found widespread ganglion cell losses (the output neurons of the eye), retinal nerve fiber layer thinning (RNFL, ganglion cell axons) and optic nerve degeneration in AD versus healthy controls

Optic nerve (CN II): Anatomy, pathway and histology Kenhu

The optic nerve leads from the eye to the optic chiasm. The optic chiasm is where some of the fibers cross. The blind spot is the region of the visual field that corresponds to the optic disc. If you tried to send these projections from brainstem and cortex all the way back to the retina then you'd end up with a blind spot that was 10.

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