The optic nerve helps in carrying visual details from the retina to the brain. It is a paired cranial nerve and is also called CN Ⅱ. This nerve is obtained from the optic stalks during the 7th week of embryonic development. The fibres of this nerve are covered by myelin that is produced from oligodendrocytes.
This optic nerve is encased with the meningeal layers. It conducts visual details and impulses to the brain. Thus, any damage to this nerve can result in loss of vision.
The optic tract is seen as an extension of the optic nerve that helps in transmitting visual information. It is composed of the right and left tract. Each of them conveys information that is exclusive to their visual field. Each tract is a blend of retinal (nasal) and temporal fibres from each eye. Thus, they carry retinal information corresponding to their visual field.
Difference between Optic Nerve and Optic Tract
|The optic nerve serves as a connection between the eye and the brain.||The optic tract is an extension of the optic nerve, and is considered a part of the brain visual system.|
|It helps in transmitting information from the retina to the brain.||The left optic tract carries retinal details from the right visual field, and the right tract carries from the left visual field.|
Explore: Structure and Function of Human Eye
Frequently Asked Questions on Difference between Optic Nerve and Optic Tract
What is a peripheral nervous system?
All nerves outside the brain and spinal cord are termed the peripheral nervous system (PNS). It connects the brain and spine to the rest of the organs and limbs. Usually, the PNS is exposed to injuries and toxins. Most cranial nerves are peripheral, although a few, like the optic nerve, come under the central nervous system.
What is a blind spot?
A blind spot is a concealment of the visual field. It is merely an absence of visual transduction (photoreceptors) in the retina. This retinal area is where the optic nerve leaves the eye.
Also Read: Mechanism of Vision
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