Dermatomes and Reflexes

Question 1

Dermatome: at the inguinal ligament

Answer 1

L1 (L1 is IL -> Inguinal Ligament)

Question 2

Dermatome: at the nipple

Answer 2

T4 (T4 at the teat pore)

Question 3

Dermatome: at the umbilicus (important for early appendicitis pain referral)

Answer 3

T10 (T10 at the belly butTEN)

Question 4

Dermatome: at the xiphoid process

Answer 4

T7

Question 5

Dermatome: erection and sensation of penile and anal zones

Answer 5

S2, S3, S4 (S2,3,4 keeps the penis off the floor)

Question 6

Dermatome: high turtleneck shirt; diaphragm and gallbladder pain referred to the right shoulder via the phrenic nerve

Answer 6

C3

Question 7

Dermatome: includes the kneecaps

Answer 7

L4 (down on L4s [all fours])

Question 8

Dermatome: low-collar shirt

Answer 8

C4

Question 9

Dermatome: posterior half of a skull “cap”

Answer 9

C2

Question 10

Name the reflex: curling of fingers/toes if palms of hands/feet are stroked

Answer 10

palmar and plantar reflexes

Question 11

Name the reflex: dorsoflexion of the big toe and fanning of other toes; sign of UMN lesion, but normal reflex in 1st year of life; S1, S2

Answer 11

Babinski

Question 12

Name the reflex: hang on for life reflex - abduct/extend limbs when startled, and then draw together

Answer 12

Moro reflex

Question 13

Name the reflex: movement of head toward one side if cheek or mouth is stroked (nipple seeking)

Answer 13

rooting reflex

Question 14

Name the reflex: sucking response when roof of mouth is touched

Answer 14

sucking reflex

Question 15

Nerve root: Achilles reflex

Answer 15

S1, S2 nerve root

Question 16

Nerve root: biceps reflex

Answer 16

C5, C6 nerve root

Question 17

Nerve root: patella reflex

Answer 17

L3, L4 nerve root

Question 18

Nerve root: triceps reflex

Answer 18

C7, C8 nerve root