What is the purpose of optic chiasm?

The optic chiasm or optic chiasma is an X-shaped space, located in the forebrain, directly in front of the hypothalamus. Crucial to vision, the left and right optic nerves intersect at the chiasm, thus creating the hallmark X-shape.

How does the optic chiasm contribute to human vision?

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 the purpose of Chiastic structure?

Chiastic structure, or chiastic pattern, is a literary technique in narrative motifs and other textual passages. An example of chiastic structure would be two ideas, A and B, together with variants A’ and B’, being presented as A,B,B’,A’.

What is a chiasm poem?

Repetition of any group of verse elements (including rhyme and grammatical structure) in reverse order, such as the rhyme scheme ABBA. Examples can be found in Biblical scripture (“But many that are first / Shall be last, / And many that are last / Shall be first”; Matthew 19:30).

What happens if optic chiasm is severed?

The entire left optic nerve would be cut and there would be a total loss of vision from the left eye. Damage at site #2: partial damage to the left optic nerve. Here, information from the nasal visual field of the left eye (temporal part of the left retina) is lost. Damage at site #3: the optic chiasm would be damaged.

What supplies optic chiasm?

Small branches of the anterior cerebral artery and the superior hypophyseal artery supply the chiasm and intracranial portion of the optic nerves whereas the optic tracts are supplied by small branches of the anterior choroidal and posterior communicating arteries.

What is antithetic parallelism in the Bible?

But those who seek the LORD shall not lack any good thing. ( Psalms 34:10) More specifically, antithetical parallelism is defined as text where the meaning in the first part of the couplet contrasts with an opposite theme contained in the second part (see above). The use of opposites clarifies both extremes.

What is a bitemporal hemianopia?

Bitemporal hemianopsia (or bitemporal hemianopia) describes the ocular defect that leads to impaired peripheral vision in the outer temporal halves of the visual field of each eye.

Where do axons in the left optic tract terminate in the human brain?

The vast majority of optic tract fibers terminate on neurons in the lateral geniculate nucleus (LGN) of the thalamus (Figure 15.3A).