WEEK 11/12 - The Retina Flashcards

1
Q

Which of the following retinal structures has contact with incoming light?

A. outer plexiform layer

B. nerve fibre layer

C. Bruch’s membranes

D. photoreceptors

A

B. nerve fibre layer

The photoreceptors are a relatively more outer layer so light reaches there last.

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2
Q

Which cells are more active under low light conditions than bright light conditions?

A. rod photoreceptors

B. cone photoreceptors

C. Koniocellular ganglion cells

D. Parvocellular ganglion cells

A

A. rod photoreceptors

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3
Q

The optic nerve head

A. is approximately 0.35 mm in diameter.

B. is approximately 5.5 mm in diameter

C. is approximately 1.5 mm horizontally and 2 mm vertically in dimension

D. is approximately 3 mm vertically and 3 mm horizontally in dimension.

A

C. is approximately 1.5 mm horizontally and 2 mm vertically in dimension

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4
Q

The peak density of cone photoreceptors occurs at

A. the ora serrata

B. the optic nerve head

C. 10 degrees eccentric from the foveola centralis

D. the foveola centralis

A

D. the foveola centralis

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5
Q

Select all that apply for this question. Phototransduction:

A. requires sufficient Vitamin A to function normally

B. Photoreceptor excitation occurs through a process of depolarisation

C. involves all-trans retinal capturing light and decomposing into 11 cis-retinal

D. occurs in the discs of the outer segments of photoreceptors

A

A. requires sufficient Vitamin A to function normally

D. occurs in the discs of the outer segments of photoreceptors

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6
Q

Which type of cone photoreceptor is most sensitive at capturing photons of light with wavelength 600 nm?

A. Green Medium wavelength sensitive

B. Blue short wavelength sensitivite

C. Red long wavelength sensitive

D. Rods

A

B. Blue short wavelength sensitivite

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7
Q

Which of the following ganglion cell types is least populous?

A. bistratified

B. parasol

C. midget

A

A. bistratified

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8
Q

The M1 layer of the right lateral geniculate nucleus relays

A. koniocellular ganglion cell information from the same eye

B. koniocellular ganglion cell information from the right eye

C. magnocellular ganglion cell information from the left eye

D. parvocellular ganglion cell information from the left eye

E. parvocellular ganglion cell information from the right eye

F. magnocellular ganglion cell information from the right eye

A

C. magnocellular ganglion cell information from the left eye

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9
Q

The most eccentric parts of the visual field are processed retinotopically at:

A. the innermost aspect of occipital lobe in the region of the calcarine fissure that is V1.

B. is presented in the superior region of the primary visual cortex.

C. is processed firstly in V2

D. is processed in the most posterior point of the occipital lobe within V1.

A

A. the innermost aspect of occipital lobe in the region of the calcarine fissure that is V1.

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10
Q

If Meyer’s loop is affected by a lesion,

A. loss of the entire visual field may occur

B. a visual field defect of the superior visual field may occur

C. a visual field defect of the inferior visual field may occur

D. a bilateral visual field defect may occur

A

D. a bilateral visual field defect may occur

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