Cutaneous innervation of upper extremity and dermatomes

Question 1

How are dermatomes determined?

Answer 1

Cutaneous innervation from axons of more than one spinal segment, they stick together until that reach their final destination

Question 2

Clavicle area

Answer 2

Supraclavicular nerves

Question 3

armpit and branches out over medial arm

Answer 3

intercostalbrachial nerve T2

Question 4

What is the intercostalbrachial nerve a branch of?

Answer 4

small lateral branch of the T2 intercostal nerve

Question 5

Around deltoid

Answer 5

superior lateral brachial nerve (from axillary mostly C5)

Question 6

Lower lateral arm

Answer 6

inferior lateral brachial nerve (from radial)

Question 7

Lower medial arm

Answer 7

Medial brachial cutaneous nerve

Question 8

Lateral anterior forearm

Answer 8

lateral antebrachial cutaneous (terminal branch of musculeocutaneous)

Question 9

Medial anterior forearm

Answer 9

medial antebrachial cutaneous

Question 10

posterior forearm

Answer 10

Posterior antebrachial cutaneous (branch of radial nerve)

Question 11

Palmar thumb and lateral 2.5 fingers

Answer 11

digital branches of median nerve

Question 12

Palmar medial 1.5 fingers

Answer 12

digital branches of ulnar nerve

Question 13

Dorsal thumb and lateral 1.5 fingers

Answer 13

superficial radial nerves

Question 14

Dorsal medial 2.5 fingers

Answer 14

ulnar nerve

Question 15

What are the nerves for cutaneous innervation of upper extremity?

Answer 15

Supraclavicular nerves C3- C4
 intercostalbrachial nerve T2
superior lateral brachial nerve C5
inferior lateral brachial nerve C5 -C8
medial brachial cutaneous nerve C8 -T1 
lateral antebrachial cutaneous (C5-C7)
medial antebrachial cutaneous (C8 -T1)
posterior antebrachial cutaneous (C5-C8)
digital branches of radial nerve (C6 -C8)
digital branches of median nerve (C5-C7)
digital branches of ulnar nerve (C8-T1)
superficial radial nerves (C5-C8)