where does the optic nerve end
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Optic nerve In humans, the optic nerve extends from the optic disc to the optic chiasm and continues as the optic tract to the lateral geniculate nucleus, pretectal nuclei, and superior colliculus.he optic nerve is ensheathed in all three meningeal layers (dura, arachnoid, and pia mater) rather than the epineurium, perineurium, and endoneurium found in peripheral nerves.
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Optic nerve Most of the axons of the optic nerve terminate in the lateral geniculate nucleus from where information is relayed to the visual cortex, while other axons terminate in the pretectal nucleus and are involved in reflexive eye movements.
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The Optic Nerve visual pathway. As the optic nerve leaves the back of the eye, it travels to the optic chiasm, located just below and in front of the pituitary gland (which is why a tumor on the pituitary gland, pressing on the optic chiasm, can cause vision problems).isual pathway. As the optic nerve leaves the back of the eye, it travels to the optic chiasm, located just below and in front of the pituitary gland (which is why a tumor on the pituitary gland, pressing on the optic chiasm, can cause vision problems).
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The Optic Nerve The optic nerve (also known as cranial nerve II) is a continuation of the axons of the ganglion cells in the retina. There are approximately 1.1 million nerve cells in each optic nerve. The optic nerve, which acts like a cable connecting the eye with the brain, actually is more like brain tissue than it is nerve tissue. visual pathway
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Glaucoma Basics & Frequently Asked Questions The optic nerve head represents the perpendicular transition of the retinal nerve fibers from the surface of the retina to the optic nerve as they exit the eye. The normal, healthy optic nerve is composed of approximately 1.2 to 1.5 million neurons or fibers.he optic nerve head represents the perpendicular transition of the retinal nerve fibers from the surface of the retina to the optic nerve as they exit the eye. The normal, healthy optic nerve is composed of approximately 1.2 to 1.5 million neurons or fibers.
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The Optic Nerve The Optic Nerve is the second of the Twelve Cranial Nerves. It consists of both afferent and efferent visual sensory fibers. The word afferent means toward the centre, as in from a peripheral area of a limb to the central nervous system. Henceforth the optic fibers travel within the optic nerve, known as the optic tract. 2  At the optic chiasm, half of the fibers continue into the optic nerve proper, while the other half cross over and continue on the contralateral side and vice versa.
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Optic nerve Optic nerve. The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves.
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Cranial Nerves That Affect the Eye This nerve exits the eye through an area in the back of the eye called the optic disk and goes to the brain stem. Once it is there, some of the nerve fibers that are from the right eye will go to the left side of the brain. Likewise, some of the fibers that are from the left eye will go to the right side of the brain.
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- In the center of the retina is the optic nerve, a circular to oval white area measuring about 2 x 1.5 mm across. From the center of the optic nerve radiate the major blood vessels of the retina.
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The area of the retina where the optic nerve leaves the eye is called the? The area of the retina where the optic nerve leaves the eye is called the A. pupil.B. cornea. C. visual cortex. D. lens E. blind spot Thanks!. blind spot there are no light-sensing cells (rods/cones) where the optic nerve passes through the retina, which is why it is, literally, a blind spot. :). Source(s): http://en.wikipedia.org/wiki/Blind_spot_...
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optic disc the small blind spot on the surface of the retina, located about 3 mm to the nasal side of the macula. It is the point where the fibers of the retina leave the eye and become part of the optic nerve. It is the only part of the retina that is insensitive to light.
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Optic disc drusen Anatomy[edit] The optic nerve is a cable connection that transmits images from the retina to the brain. It consists of over one million retinal ganglion cell axons. The optic nerve head, or optic disc is the anterior end of the nerve that is in the eye and hence is visible with an ophthalmoscope. It is located nasally and slightly inferior to the macula of the eye.
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Optic Nerve Anatomy The optic nerve lies completely within the central nervous system and is the second cranial nerve (CN II). Optic nerve anatomy is similar to brain tissue and differs from peripheral nerves in several ways. The optic nerves extends from the back of the eye to the visual centers of the brain.slide 1 of 5. The optic nerve is the nerve of sight and is the second of twelve paired cranial nerves. It is also known as CN II. This nerve is part of the central nervous system and connects the eye to the brain.hen the eye is open, light hits the retina and initiates nerve impulses that travel along the optic nerves to the visual centers of the brain. The spot on the retina where the optic nerve leaves the eye is called the optic disc.
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nerve 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.
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The Optic Nerve From there, the nerve fibers become the optic tract, passing through the thalamus and turning into the optic radiation until they reach the visual cortex in the occipital lobe at the back of the brain. This is where the visual center of the brain is located.
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optic It then passes backward and undergoes a division; those nerve fibers leading from the nasal side of the retina cross to the opposite side in the optic chiasma while those from the temporal side continue to the thalamus uncrossed.
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- Nerve innervation may help doctors find the precise area of damage in the spinal cord. The optic nerve transmits the signals of the eye to the brain. The nervous system originates in the brain and then descends to the spinal cord. Nerves run throughout the body, carrying electrical impulses to and from the spinal cord.
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Optic disc The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye. Because there are no rods or cones overlying the optic disc, it corresponds to a small physiological blind spot in each eye. The ganglion cell axons form the optic nerve after they leave the eye.The optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. The optic disc is also the entry point for the major blood vessels that supply the retina.The optic disc in a normal human eye carries from 1 to 1.2 million neurons from the eye towards the brain.he optic disc is placed 3 to 4 mm to the nasal side of the fovea. It is a vertical oval, with average dimensions of 1.76mm horizontally by 1.92mm vertically. There is a central depression, of variable size, called the optic cup.
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- The axons of the 3° visual afferents (the retinal ganglion cells) form the optic nerve fiber layer of the retina on their course to the optic disc. At the optic disc, the 3° visual afferents exit the eye and form the optic nerve.The fibers of the optic nerve that originate from ganglion cells in the nasal half of the retina (i.e., the nasal hemiretina) decussate in the optic chiasm to the opposite optic tract (Figure 15.1).he information from the eye is carried by the axons of the retinal ganglion cells (the 3° visual afferent) to the midbrain and diencephalon. This chapter will provide more information about visual pathway organization and the visual processing that occurs within the brain.
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Medical Definition of Optic nerve Optic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. These impulses are dispatched through the optic nerve to the brain, which interprets them as images.Using an ophthalmoscope, the head of the optic nerve can be easily seen.he word optic comes from the Greek optikos, pertaining to sight. Aside from the optic nerve, the eye has a number of other components. These include the cornea, iris, pupil, lens, retina, macula, and vitreous.
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- Optic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. These impulses are dispatched through the optic nerve to the brain, which interprets them as images.
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What causes your blind spot? The optic nerve (also known as cranial nerve II) is a continuation of the axons of the ganglion cells in the retina. There are approximately 1.1 million nerve cells in each optic nerve.