Visual Pathway Flashcards
What is the central visual pathway?
The main pathway for conscious site
Where do the axons from the nasal half of retina go when the reach the chiasm?
They cross to the contralateral optic tracts
Where do the axons from the temporal half of retina go when they reach the chiasm?
They continue ipsilaterally
Where do 90% of fibres from optic tracts synapse?
The lateral geniculate nucleus of the thalamus
What do the other 10% of fibres from optic tract form?
The superior brachium
Where does the superior brachium pass to?
The superior colliculus
Where do the optic radiation neurons arise?
The lateral geniculate nucleus
Where do the optic radiation neurons pass to?
Primary visual cortex on medial surface of occipital lobe
Where does the upper loop of the optic radiation pass through?
The parietal lobe
Where does the upper loop of the optic radiation terminate?
The superior margin of the calcarine sulcus
Where does the lower loop of the optic radiation pass through?
The temporal lobe
Where does the lower loop of the optic radiation terminate?
The inferior margin of the calcarine sulcus
What are the four main layers of the retina?
The pigment, photoreceptor, bipolar and ganglion layers
What is the function of the pigment layer?
Absorbs light and prevents reflection
What do the bipolar cells represent?
1st order neurons for this pathway
