superficial reflexes

Question 1

corneal

Answer 1

involuntary blink to corneal stim
afferent: ophthalamic branch (V1) of trigeminal N
efferent: facial N

Question 2

abdominal reflex

Answer 2

t7-12
contraction of sup ab mm when stroking abs lightly (lat to med)
significant if asymmetrical - signifies UMN lesion on absent side

Question 3

cremasteric

Answer 3

t12-l1
contraction of cremaster m (pulls up scrotum) after stroking same side of sup/inner thigh
absent with: SCI and corticospinal lesions

Question 4

plantar

Answer 4

s1-2, tibial N
pf of toes is elicited when stroking lateral sole of foot from calc to base of 5th met
DF of great toe and fanning of 4 small toes- babinski with corticospinal/umn

Question 5

anal

Answer 5

contraction of external anal sphincter upon stroking skin around anus (afferent: pudendal N; efferent s2-4)

Question 6

bulbocavernosus

Answer 6

s2-4
anal sphincter contraction in response to squeeze glans penis or tug on indwelling foley cath
first reflex after sci - indicates the body is out of spinal shock