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What blindness causing disease originates not in the eye but the brain?
pituitary adenoma affecting the optic chiasm.
Where is the optic chiasm?
The optic Chiasm is located where the optic nerves partially cross on the brain
Where do the two optic nerves reach the diencephalon?
The two optic nerves reach the diencephalon at the optic chiasm, a structure located at the base of the brain where the nerves partially cross over each other. From the optic chiasm, the optic nerves continue on to the thalamus within the diencephalon.
What is the point called at which the optic nerves cross?
The optic chiasm
Can pituitary gland tumor cause blindness?
Yes, a pituitary gland tumor can cause vision problems such as bitemporal hemianopsia (loss of outer visual fields on both eyes), which may lead to blindness if left untreated. This occurs due to the tumor pressing on the optic nerves or optic chiasm located near the pituitary gland. Prompt diagnosis and treatment are essential to prevent permanent vision loss.
Is Optic chiasm the blind spot of eye?
No. The blind spot in the eye is the optic disc, the point where the optic nerve meets the retina. At this point, there are no photoreceptors, so no detection of vision. The optic chiasm is the place near the brain where the optic nerves cross over.
The crossing over of the optic nerves is the?
Optic chiasm is located around the pituitary gland.
What is the anterior visual pathway?
The anterior visual pathway refers to the pathway that visual information takes from the eyes to the visual cortex in the brain. It includes the optic nerves, optic chiasm, optic tracts, and lateral geniculate nucleus. This pathway is responsible for transmitting visual signals from the retina to the brain for processing and interpretation.
What does optic chiasm mean literally?
Optic chiasm literally means "crossing of the optic nerves." It is the point in the brain where optic nerve fibers from each eye partially cross over to the opposite side of the brain, allowing visual information to be processed.
What happens at the optic chiasm?
At the optic chiasm, located at the base of the brain, the optic nerves from each eye partially cross over. This crossover allows visual information from the right visual field of each eye to be processed by the left side of the brain and vice versa. This arrangement enables the brain to integrate visual input from both eyes for a comprehensive visual perception.
What would happen if the optic chiasm was cut?
If the optic chiasm is cut, it can result in visual field defects such as loss of peripheral vision on the outer sides of both eyes, known as bitemporal hemianopia. This occurs because the crossing of optic nerve fibers at the chiasm is disrupted, affecting information from both eyes.
What cant be seen as one looks into the eye with an ophthalmoscope?
Optic Chiasm - a crossing point of the optic nerves.
