Wk 10: Dermatomes

Question 1

Sensory region innervated by

Radial n. (5)

Answer 1

Lateral upper arm
Posterior arm below shoulder
Posterior forearm
Dorsum of hand lateral to axial
line of 4th digit
Radial side of thumb

Question 2

Sensory region innervated by

Axillary n. (1)

Answer 2

Lateral upper arm at shoulder

Question 3

Sensory region innervated by

Intercostobrachial and medial brachial cutaneous n. (1)

Answer 3

Medial upper arm to elbow

Question 4

Sensory region innervated by

Medial antebrachial cutaneous (2)

Answer 4

Anterior upper arm
Anterior and medial forearm to the
wrist

Question 5

Sensory region innervated by

Musculocutaneous n. (1)
- Lateral antebrachial cutaneous

Answer 5

Lateral forearm to wrist

Question 6

Sensory region innervated by

Median n. (2)

Answer 6

PALMAR: 1st, 2nd, 3rd digits, radial
side of 4th digit
DORSAL: 1st, 2nd, 3rd, 4th digit tips

Question 7

Sensory region innervated by

Ulnar n. (2)

Answer 7

Hypothenar eminence
Ulnar side of the 4th digit and
entire 5th digit

Question 8

Nerve that innervates:

Lateral upper arm at shoulder

Answer 8

Axillary n.

Question 9

Nerve that innervates:

Medial upper arm to elbow

Answer 9

Intercostobrachial cutaneous n.
Medial brachial cutaneous n.

Question 10

Nerve that innervates:

Anterior upper arm
Anterior and medial forearm to the
wrist

Answer 10

Medial antebrachial cutaneous n.

Question 11

Nerve that innervates:

Lateral forearm to the wrist

Answer 11

Musculocutaneous n.

Question 12

Nerve that innervates:

Lateral upper arm
Posterior arm below shoulder
Posterior forearm
Dorsum of the hand lateral to axial
line of the 4th digit
Radial side of the thumb

Answer 12

Radial n.

Question 13

Nerve that innervates:

PALMAR: 1st, 2nd, 3rd digits, radial
side of 4th digit
DORSAL: 1st, 2nd, 3rd, 4th digit tips

Answer 13

Median n.

Question 14

Nerve that innervates:

Hypothenar eminence
Ulnar side of the 4th digit and
entire 5th digit

Answer 14

Ulnar n.