4th vent

Question 1

it forms the floor of the 4th ventricle

Answer 1

rhomboid fossa

Question 2

continuation of post median sulcus of SC

Answer 2

posterior median fissure

Question 3

shallow diamond depression on dorsal surface of pons and medulla

Answer 3

rhomboid fossa

Question 4

vagal trigone is formed by ______

Answer 4

protuberance of dorsal motor nuc of CN X

Question 5

hypoglossal trigone is formed by ______

Answer 5

protub of CN XII

Question 6

betw vagal and hypoglossal trigone which is medial and lat

Answer 6

vagal is lat; hypoglossal is medial

Question 7

bundle of facial nerve winding around abducens nuc

Answer 7

facial colliculus

Question 8

thin layer of tissue suspended between superior cerebellar peduncles

Answer 8

anterior medullary velum

Question 9

the pyramids carry which tracts

Answer 9

cotricospinal to SC and corticobulbar to brainstem

Question 10

fiber pass around lat surface of medulla to enter via ICP

Answer 10

anterior external arcuate fibers

Question 11

rootlets that emerge lateral to olive

Answer 11

CN IX-XI

Question 12

rootlets that emerge medial to olive and lat to pyramid

Answer 12

CN XII

Question 13

where does the level of lemnisci or sensory decuss occur

Answer 13

inferior half of medulla above the pyramidal decuss