The optic chiasm is an X-shaped structure formed by the crossing of the optic nerves in the brain. The optic nerve connects the brain to the eye. To biologists, ...

At the optic chiasm axons make a key binary decision either to cross the chiasmal midline to innervate the contralateral optic tract or to remain uncrossed and innervate the ipsilateral optic tract.

Williams, S. E. Ephrin-B2 and EphB1 mediate retinal axon divergence at the optic chiasm. Neuron 39 , 919–935 (2003) Article CAS Google Scholar ...

It leaves the orbit (eye) via the optic canal, running postero-medially towards the optic chiasm where there is a partial decussation (crossing) of fibers from the temporal visual fields of both eyes.

Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are ...

Low Grade Glioma of the Optic Nerves, Chiasm and Tracts. T1-weighted coronal MRIs. Note the diffuse enlargement of both optic nerves, the optic chiasm and both optic tracts. One can easily appreciate ...

The optic chiasm and infundibulum (pituitary stalk) could not be identified on coronal or sagittal images (Figure 1). Visual field on confrontation suggested lateral field deficits ...

This type of hemianopia is caused by a lesion on your optic chiasm. This is the area in your brain where the optic nerves cross and form an “X.” ...

Optic nerve gliomas develop anywhere between the optic nerve head next to the retina and the optic chiasm, where the left and right optic nerves partially cross.

Pituitary tumors affect the optic nerves primarily through physical compression. As the tumor grows, it may compress the optic chiasm, a critical structure directly above the pituitary gland.