Other

Question 1

Posterior cutaneous nerve of arm Contributing spinal nerves Source Course and distribution

Answer 1

C5-C8 Radial nerve (in axilla) Crosses posterior to and communicates with intercostobrachial nerve and supplies skin on posterior arm as far as olecranon

Question 2

Posterior cutaneous nerve of forearm Contributing spinal nerves Source Course and distribution

Answer 2

C5-C8 Radial nerve (w/ inferior lateral cutaneous nerve of arm) Perforates lateral head of triceps, descends laterally in arm, then runs along and supplies posterior forearm to wrist

Question 3

Lateral cutaneous nerve of forearm Contributing spinal nerves Source Course and distribution

Answer 3

C6-C7 Musculocutaneous n (terminal br) Emerges lateral to biceps tendon deep to cephalic v, supplying skin of anterolateral forearm to wrist

Question 4

Medial cutaneous nerve of forearm Contributing spinal nerves Source Course and distribution

Answer 4

C8-T1 Medial cord of brachial plexus (in axilla) Descends medial to brachial artery, pierces deep fascia with basilic v in midarm, dividing into anterior and posterior branches that enter forearm and supply skin of anteromedial aspect of wrist

Question 5

Medial cutaneous nerve of arm Contributing spinal nerves Source Course and distribution

Answer 5

C8-T2 Medial cord of brachial plexus (in axilla) Communication with intercostobrachial nerve, continuing to supply skin of medial aspect of distal arm

Question 6

Intercostobrachial nerve Contributing spinal nerves Source Course and distribution

Answer 6

T2 2nd intercostal nerve (as its lateral cutaneous br) Extends laterally, communicating with posterior and medial cutaneous nerves of arm, supplying skin of axilla and medial aspect of proximal arm