Optic Radiation - Parts

Parts

A distinctive feature of the optic radiations is that they split into two parts on each side:

Source Path Information Damage
Fibers from the inferior retina (also called "Meyer's loop" or "Archambault's loop") must pass through the temporal lobe by looping around the inferior horn of the lateral ventricle. Carry information from the superior part of the visual field A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of vision in a superior quadrant (quadrantanopia or "pie in the sky" defect.)
Fibers from the superior retina (also called "Baum's loop") travel straight back through the parietal lobe to the occipital lobe in the retrolenticular limb of the internal capsule to the visual cortex. Carry information from the inferior part of the visual field Taking the shorter path, these fibers are less susceptible to damage.

Read more about this topic:  Optic Radiation

Famous quotes containing the word parts:

    “The squirming facts exceed the squamous mind, If one may say so.”
    —Wallace Stevens 1879–1955, U.S. poet. “Connoisseur of Chaos,” Parts of a World (1942)

    “To give an accurate description of what has never occurred is not merely the proper occupation of the historian, but the inalienable privilege of any man of parts and culture.”
    —Oscar Wilde (1854–1900)

    “In making a speech one must study three points: first, the means of producing persuasion; second, the language; third the proper arrangement of the various parts of the speech.”
    —Aristotle (384–323 B.C.)