CHIASMAL AND POSTCHIASMAL NEUROLOGIC DEFICITS

Lesions at the optic chiasm will result in bitemporal hemianopsia, caused by damage to the fibers from the nasal segment of both retinas. Interruption of the optic tract (that portion of the visual pathways between the chiasm and lateral geniculate body) results in a contralateral homonymous hemianopsia. Similarly, lesions of the optic radiations or striate cortex will cause partial or complete contralateral homonymous hemianopic defects.

VISUAL SYSTEM: RETINAL PROJECTIONS

The main retinal projection is to the dorsal lateral geniculate nucleus, which then projects to the visual cortex. The retinogeniculostriate system thus formed is the basis for essentially the entire visual consciousness in man.

Related posts:

Arteries of Spinal Cord Mandibular Nerve (V3) Cervical Spondylosis Distribution of Motor and Sensory Fibers Cell Types of Nervous System Autonomic Nerves in Neck

Stay updated, free articles. Join our Telegram channel

Join