Lecture 10 Visual Pathways

T/F: Retinal ganglion cells are peripheral sensory neurons.

In the 5 vesicle stage, the optic cups are connected to the _______. They become the _______ in the later stage.

_______ has the greatest density of visual receptors.

Photoreceptors are the (innermost/outermost) layer of the eye.

Types of photoreceptors and their functions.

Three layers of the cells in the eye from out to innermost.

T/F: Photoreceptors are the 1st order neurons of the optic pathway.

The ______ has very high density of cones while the _____ has very high density of rods.

The axons leave the retina at ________, which is also the blind spot.

The opthalamic blood vessels branch off the ______.

The optic nerve is myelinated by ________.

The 1st degree axons in the optic tract synapse with 2nd order neurons in the __________.

The 2nd order axons project to the _______ via the _______ in corona radiata.

Other than visual perception, the 1st order axons in the optic tract also synapse with _________, ________, and ______.

The optic tract wraps around the outer surface of the ______.

Lable the strucures on the inferior view of visual pathway.

Draw the entire optic pathway on the sketch. Pay attention to the 1) retrolenticulae part and 2) Meyer's loop in temporal lobe.

The retrolenticulae part is in the _______ while the Meyer's loop is in ________.

______ axons in the optic nerve decussates.

The LGN is made of _____ magnocellular layers and ______ parvoellular layers.

The magnocellular layer processes _________

Layer ____ receives motion from contralateral side while layer _____ receives motion from ipsilateral side.

The parvocellular layers process sub-modality of ________.

Locate the LGN, internal capsule (posterior limb retrolenticular part), optic radiation, and posterior commissure on the cross-section of the brain.

Locare the superior colliculi and pretectal area on the cross- section of brain.

Lable the 4 quadrants of the visual field.

If both eyes see their respective fields, you have ______ vision.

The R eye can see the R visual fiald for about _______ degrees and the L visual field for about ____ degrees.

Lable the
1) L and R hemifield
2) L and R monocular crescent
3) binocular zone (central visual field)

Draw a graph with visual fields and their respective zones on the retina.

Binocular zone projects to _________ hemiretinas.

Track hemifield in visual pathway.

The superior retina samples the ______ visual field and vice versa.

The meyer's loop for ________ visual field and brings it to the ____ bank of calcarine sulcus

Damage to R optic nerve results in loss in ________.

Damage to optic chiasm results in loss of ____________.

Damage to the R optic tract will results in loss of __________.

Another damage that can also cause homonymous hemianopia is _______.

Damage to R Meyer's loop will result in ________.

Damage to the inferior bank of BA17 will result in _________.

Damage to the superior bank of BA17 will result in ________.

Damage to inferior and superior banks of BA17 also causes _________.

The sensory input and motor output of pupillary light reflex are _______.

Constriciton of the ipsilateral eye is called ______ while constriction of the contralateral eye is called ________.

Outline the response of pupillary reflex

Where does the axon from pretectum decussate to reach the Edinger-Westphal nucleus?

Fill out the table on slide 22.

Locate the Edinger-Westphal nucleus on the midbrain cross-section.

The axons of Edinger-Westphal and oculomotor exits the midbrain in CN _____.