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Activity 4: Visual Pathways to the Brain and Predicting the Effects of Visual Pathway Lesions

front 1

The axons of the ganglion cells of the retina converge at what aspect of the eyeball and exit from the eye at what nerve?

back 1

Converge at the posterior aspect of the eyball and exit the eye at the optic nerve.

front 2

The fibers from the medial side of each eye cross over to the opposite side at which eye feature?

back 2

Optic chiasma

front 3

The fiber tracts formed after the cross-over point of the optic chiasma are called what?

back 3

Optic tracts

front 4

Each optic optic tract contains fibers from the lateral side of the eye on the (same/opposite) side and from the medial side of the eye on the (same/opposite) side.

back 4

Same, opposite

front 5

The optic tract fibers synapse with neurons in which feature of the thalamus?

back 5

Lateral geniculate nucleus of the thalamus

front 6

The neurons in the lateral geniculate nucleus that synapse with the optic tract fibers form what radiation?

back 6

Optic radiation

front 7

The optic tract fibers after synapsing with neurons in the lateral geniculate nucleus of the thalamus, whose axons form the optic radiation, terminates in which cortex of which lobe?

back 7

Terminates in the primary visual cortex in the occipital lobe.

front 8

1. The optic fiber tracts after terminating in the primary visual cortex in the occipital lobe then synapse with what type of neurons?

2. Which type of interpretation then occurs?

back 8

1. Cortical neurons

2. Visual interpretation

front 9

Determine what effects lesions in the following areas would have on vision.

  • In the right optic nerve:
  • Through the optic chiasma:
  • In the left optic tract:
  • In the right cerebral cortex (primary visual cortex):

back 9

  • In the right optic nerve: Right monocular vision loss (i.e. complete blindness for right eye)
  • Through the optic chiasma: Bitemporal hemianopia (i.e. tunnel vision)
  • In the left optic tract: Right homonymoas hemianopia (i.e. vision loss in right hemispheres for both eyes)
  • In the right cerebral cortex (primary visual cortex): Left homonymoas hemianopia with macular sparing

front 10

back 10

front 11

back 11