Visual System: Central Visual Pathways

Question 0

4 targets of RGCs

Answer 0

1. LGN
2. Superior Colliculus
3. Pretectum
4. Hypothalamus

Question 1

Perforated Substance

Answer 1

Area where penetrating arteries enter the brain

Question 2

LGN

Answer 2

Processes info from contralateral field of vision; found in the posterior lateral part of the thalamus

*Projects to Area 17 via geniculo-calcarine tract (optic radiations)

Question 3

Geniculo-calcarine tract

Answer 3

Medial axons travel dorsally over lateral ventricle and synapse in the cuneus gyrus

LATERAL axons travel rostrally around inferior horn of lateral ventricle making Meyer’s Loop; synapse in the lingual gyrus

Question 4

Extrastriate visual areas

Answer 4

Higher-order visual areas

*Ventral projections= What

Dorsal projections= Where

Question 5

Superior Colliculus projections

Answer 5

Thalamus

Pulvinar

CN III, IV, VI

Reticular Formation

Cervical Spinal Cord

Question 6

Suprachiasmatic Nucleus in the Hypothalamus

Answer 6

Receives input about ambient light; involved in regulating normal circadian rhythm