Difference Between Optic Nerve and Optic Tract

what are bundled together to form the optic nerve? ... what is the difference between optic nerve and tract? -optic nerve is only from one eye. -optic tract fibers from both eyes which is 60% crosses the optic chiasm and 40% continue to the thalamus and midbrain targets on the same side.

1. What is optic tract?
2. Why is optic nerve a tract?
3. What does the optic tract contain?
4. Where is the optic tract located?
5. What is function of optic nerve?
6. What is the function of optic tract?
7. Why optic nerve is not a true cranial nerve?
8. How is optic nerve formed?
9. Which cells are lost in glaucoma?
10. Why does the optic nerve crossover?
11. What is optic nerve head?
12. Which side of the brain affects vision?

What is optic tract?

The optic tract is a bundle of nerve fibers that serves to carry visual information from the optic chiasm to the left and right lateral geniculate bodies as a part of the visual pathway.

Why is optic nerve a tract?

The axons of the retinal ganglion cells converge to form the optic nerve, which after a partial decussation at the optic chiasm forms the optic tract. The optic tract is an important part of the visual pathway.

What does the optic tract contain?

The optic tract carries retinal information relating to the whole visual field. Specifically, the left optic tract corresponds to the right visual field, while the right optic tract corresponds to the left visual field.

Where is the optic tract located?

The optic tract is a cylindric, slightly flattened band of fibers approximately 3.5 mm high and 5.1 mm long that runs from the posterolateral corner of the optic chiasm to the LGN. Most of the fibers (which are still the axons of retinal ganglion cells) terminate in the LGN.

What is function of optic nerve?

The optic nerve, also known as cranial nerve II, or simply as CN II, is a paired cranial nerve that transmits visual information from the retina to the brain.

What is the function of optic tract?

The optic tract primarily conveys visual information from the optic chiasm to the lateral geniculate nuclei.

Why optic nerve is not a true cranial nerve?

The optic nerve (II) is not a true nerve but is actually an extension of a brain tract; in fact, II is myelinated by oligodendrocytes rather than Schwann cells. Therefore, cranial nerves I and II are part of the CNS, and the rest are considered part of the PNS.

How is optic nerve formed?

The optic nerve is formed by the convergence of axons from the retinal ganglion cells. These cells in turn receive impulses from the photoreceptors of the eye (the rods and cones). After its formation, the nerve leaves the bony orbit via the optic canal, a passageway through the sphenoid bone.

Which cells are lost in glaucoma?

The layer of nerve tissue in the eye that contains the ganglion cells (the retina) is a very complicated network of 10 types of cells. Ganglion cells are the only ones to die from glaucoma, but their loss causes rearrangements in the retina and up in the brain's relay centers to which they go.

Why does the optic nerve crossover?

The partial crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric visual field from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate binocular and stereoscopic vision.

What is optic nerve head?

Anatomical terminology. 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 blind spot in each eye.

Which side of the brain affects vision?

The occipital lobe is the back part of the brain that is involved with vision. Temporal lobe.