The General control of Vision Flashcards
What does the optic nerve tract contain?
nerve fibers from both retinae
Where is the optic tract have visual pathways?
in each cerebral hemisphere so it can receive signals from both eyes.
Nerve fibers from both retinae are project where?
structures in both right and left visual pathways.
How does the visual pathways receive signals?
from only one half of the visual field of each eye.
The visual pathway of the left cerebral hemisphere receive signals from where?
the right nasal visual field and vice versa.
What forms an optic nerve?
the axons of retinal ganglion cells.
What does decussate mean?
cross over
The optic nerve fibers from each nasal halves of each retina do what?
cross over at the optic chiasm.
The optic nerve fibers from the temporal halves do what?
remain on the same side or ipsilateral.
What is ipsilateral?
on the same side.
The nerve fibers from nasal halves combine with fibers from opposite temporal halves of the retinae to form what?
the two optic tracts.
What forms the two optic tracts?
The nerve fibers from nasal halves combine with fibers from opposite temporal halves of the retinae.
Thalamus will transport the signal to where?
the visual cortex
What part of the brain does melanopsin perceive light?
mid brain
What occurs in the occipital lobe?
Where our vision is processed
What is the main role of the superior colliculus?
To react moves eyes without moving head when sounds occur.
What is known as the optic tectum?
The superior colliculus.
Where is the superior colliculus located?
In the dorsal aspect of the midbrain (mesencephalon).
Where is the midbrain located?
in the central to the two thalami.
