Where is the location of the optic chiasm?
The optic chiasm is situated at the junction of the anterior wall and floor of the third ventricle. The anterior cerebral and anterior communicating arteries, the lamina terminalis, and the third ventricle are located above the chiasm.
Is the optic chiasm in the occipital lobe?
The visual pathways comprise the optic nerve, optic chiasm, optic tract, optic radiation and the visual cortex in the occipital lobes. Nerve impulses arising in the retina travel via the optic nerve to the optic chiasm.
Where is the optic nerve located in the skull?
Accompanied by the ophthalmic artery, the optic nerve enters the bony skull through the optic foramen and travels within the optic canal to reach the middle cranial fossa. Located in the middle cranial fossa is the optic chiasm.
Where is the optic chiasm located quizlet?
is the part of the brain where the optic nerves (CN II) partially cross. The optic chiasm is located at the bottom of the brain immediately below the hypothalamus.
What is optic chiasm in the brain?
The optic chiasm is an X-shaped structure formed by the crossing of the optic nerves in the brain. 1 It is thought that the crossing and uncrossing optic nerve fibers that travel through the optic chiasm developed in such a way to aid in binocular vision and eye-hand coordination.
What takes place in the optic chiasm?
In the optic chiasm, the fibers of the nasal retina (i.e., the temporal visual field) of each eye cross, whereas the fibers of the temporal retina (i.e., the nasal visual field) of each eye proceed uncrossed. Thus, each optic tract contains visual fibers from the same hemifield of each eye.
What is the optic chiasm?
The place in the brain where some of the optic nerve fibers coming from one eye cross optic nerve fibers from the other eye. Also called optic chiasm.
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).
What is the function of the 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.
What is the ciliary ganglion?
Ciliary ganglion is a peripheral parasympathetic ganglion. It is situated near the apex of orbit between the optic nerve and lateral rectus muscle. It is related medially to the ophthalmic artery and laterally to the lateral rectus muscle.
What happen at optic chiasm?
When the axons of the optic nerve reach the optic chiasm where do they go?
At the optic disc, the 3° visual afferents exit the eye and form the optic nerve. The fibers of the optic nerve that originate from ganglion cells in the nasal half of the retina (i.e., the nasal hemiretina) decussate in the optic chiasm to the opposite optic tract (Figure 15.1).