RHSC420 FINAL EXAM PRACTICE
QUESTIONS AND ANSWERS
How do images in our visual field that project to the retina look like? -
Answer️️ -REVERSED and INVERTED
Describe the optic pathway - Answer️️ -1) Retinal fibers take info from
contralateral visual field
-Nasal retinal and temporal re...
How do optic radiation projection differ based on visual field? -
Answer✔️✔️-Upper: Afferent from lower retina, loop around the inferior
horn of lateral ventricle (Meyer's loop), synapse below calcarine sulcus
Middle: Afferents from fovea project through parietal lobe and synapse
above/below calcarine sulcus
Lower: Afferent from upper retina project into parietal lobe and synapse
above calcarine sulcus
How is the visual field represented in the primary visual cortex? -
Answer✔️✔️-Middle visual field is represented more anteriorly, peripheral
visual field represented more posteriorly
What does rods/cones specialize in? - Answer✔️✔️-Rods: Dim light, high
sensitivity to light
Cones: Visual acuity in bright light/colour vision
-Only cones in the fovea, periphery has more rods
Blood supply in the eye and visual cortex - Answer✔️✔️-Retina has dual
blood supply - ciliary/retinal vessels
How is visual info processed? - Answer✔️✔️-Primary visual cortex
integrates the info and projects it to association areas through
dorsal/ventral streams
What are the innervations for the extraocular mm? - Answer✔️✔️-Rectus (4)
/ Obliques (2)
-LR6SO4, all the rest are 3
What tract is critical in coordinating eye mov'ts + what facilitates
coordinates eye mov'ts? - Answer✔️✔️--MLF
-Vertical gaze center - Midbrain (midbrain RF/pretectal area)
-Horizontal gaze center - Pons (paramedian pontine RF)
Describe horizontal gaze circuitry - Answer✔️✔️-1) PPRF provides input to
CN6 (directs gaze to ipsilateral side)
2) CN6 stimulates ipsilateral LR
3) CN6 AP crosses midline through MLF to contralateral CN3
3
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