Upper limb innervation

Question 1

Injury of musculocutaneous nerve

Answer 1

innervates the anterior compartment of the arm which can lead to difficulties in elbow flexion and numbness of skin of lateral forearm

Question 2

Injury of Median nerve

Answer 2

Innervates anterior forearm which can lead to difficulties with wrist flexion. NUmbness of skin on the lateral palm (thumb/thenar) and lateral digits

Question 3

Injury of Ulnar nerve

Answer 3

Innervates hypothenar muscles and other intrinsic hand muscles which can lead to numbness in skin on medial hand (palm)

Question 4

Injury of axillary nerve

Answer 4

Innervates deltoid muscle which could lead to numbness in the skin over the shoulder. Can also lead to difficulties in arm abduction

Question 5

Injury of Radial nerve

Answer 5

Innervates muscles in the posterior compartment of arm and forearm. Damage can lead to numbness in skin over posterior arm, forearm, and posterior/dorsal hand in addition to weak wrist extension

Question 6

Identify the nerve most likely to be damaged and describe the somatic impairments that could result from a fracture to each of the following areas of the humerus

Answer 6

Surgical neck: auxillary nerve

Question 7

Axillary nerve: Somatic symptoms of impairments

Answer 7

weak abduction of arm (deltoid damaged), numbness overshlulder

Question 8

Radial nerve: somatic symptoms of impairment

Answer 8

Weak wrist extension (due to damage to posterior forearm), wrist drop, numbness of posterior forearm and hand

Question 9

Ulnar nerve: somatic symptoms of impairment

Answer 9

Weak gri; (hypothenar area and innervates other intrinsic hand muscles), numbness of medial digits, hitting your “funny bone”

Question 10

Describe the nerve involved in carpal tunnel syndrome and the somatic impairments associated with carpal tunnel syndrome

Answer 10

Compression of median nerve: inflammation of structures in the carpal tunnel can lead to medial nerve compression, Possibly related to overuse.

Question 11

Carpal tunnel syndrome: somatic symptoms of impairment

Answer 11

Weak hand grip, loss of thumb opposition, loss sensation in lateral digits

Question 12

Medial brachial plexus cord

Answer 12

Median nerve, ulnar nerve

Question 13

Lateral brachial plexus cord

Answer 13

Musculocutaneous nervem median nerve

Question 14

Posterior brachial plexus cord

Answer 14

Axillary nerve, radial nerve