Forearm- Nerve Supply

Question 1

Median Nerve pathway in the forearm

Answer 1

In cubital fossa: courses medial to brachial art & biceps brachii tendon –> 2 heads of pronator teres
Enters wrist underneath flexor retinaculum (over carpal tunnel) - between palmaris longus & flexor carpi radialis
Enters hand through the carpal tunnel, underneath flexor retinaculum at the wrist.

Question 2

Median nerve innervations

Answer 2

muscular branches –> superficial and intermediate layers of anterior forearm - except flexor carpi ulnaris

anterioir interosseous nerve –> deep layer ant compratment - except ulnat half of flexor digitorum profundus

before entering wrist:
Palmar cutaneous branch –> skin of central palm

Question 3

Ulnar nerve course

Answer 3

posterioir to med epicondyle –> between heads of flexor carpi ulnaris
Over flexor digitorum profundus
at the wrist: enters through Guyon’s canal

Question 4

Ulnar nerve innervations

Answer 4

Medial flexor digitorum profundus & flexor carpi ulnaris

Gives off palmar and cutaneous branches of the forearm & digital branches of the hand –> medial skin of the hand

Question 5

Radial nerve course

Answer 5

enters cubital fossa between brachioradialis & brachialis - ant to lateral epicondyle –> branches into superficial and deep branch

Question 6

Radial nerve innervation

Answer 6

B4 cubital fossa: post cutaneous nerve –> skin of post forearm to wrist
Posterior interosseous nerve - all post. forearm muscles
Superficial bracnh - cutaneous innervation of anatomical snuffbox, dorsal hand and fingers