Brachial Plexus

Question 0

Musculocutaneous Nerve

Answer 0

C5 - C7

Motor - All muscles in anterior compartment of the arm

Sensory - Skin on lateral side of forearm

Key landmark: nerve pierces coracobrachialis muscle

Question 1

Long Thoracic Nerve

Answer 1

Innervates Serratus Anterior

Question 2

Axillary Nerve

Answer 2

C5-C6

Motor - Deltoid, teres minor

Sensory - Skin over upper lateral part of arm

Question 3

Ulnar Nerve

Answer 3

C8, T1

Motor - All intrinsic muscles of the hand EXCEPT 3 thenar (thumb) muscles and 2 lateral lumbricals; ALSO flexor carpi ulnaris and medial half of flexor digitorum profundus in the forearm

Sensory - skin over palmar surface of medial 1.5 digits and associated palm and wrist; skin over dorsal surface of the medial 1.5 digits

Question 4

Radial Nerve

Answer 4

C5-C8, T1

Motor - All muscles in posterior compartments of arm and forearm

Sensory - Skin of posterior arm, posterior forearm, dorsolateral hand and dorsal side of proximal part of lateral 3½ digits.

Question 5

Median Nerve

Answer 5

C5-C8, T1

Motor - All muscles in the anterior compartment of the forearm (flexor carpi ulnaris and medial half of flexor digitorum profundus), 3 thenar (thumb) muscles of the thumb, and 2 lateral lumbrical muscles

Sensory - Skin over palmar surface of the lateral 3 and one half digits and over the lateral side of the palm and middle of the wrist

Question 6

Side Branches of Posterior Cord (3)

Answer 6

1) Upper Subscapular nerve
2) Thoracodorsal nerve
3) Lower Subscapular nerve

Question 7

Upper Subscapular Nerve

Answer 7

Innervates subscapularis

Question 8

Thoracodorsal nerve

Answer 8

Innervates lattissimus dorsi

Question 9

Lower Subscapular Nerve

Answer 9

Innervates subscapularis and teres major

Question 10

Terminal Branches of Posterior Cord (2)

Answer 10

1) Axillary nerve (C5, C6)

2) Radial nerve (C5-C8, T1)

Question 11

Terminal Branches of Lateral Cord

Answer 11

1) Musculocutaneous nerve

2) Lateral part of median nerve

Question 12

Side Branch of Lateral Cord

Answer 12

Lateral Pectoral Nerve

Question 13

Terminal Branches of Medial Cord (2)

Answer 13

1) Ulnar Nerve

2) Medial Part of Median Nerve

Question 14

Side Branches of Medial Cord (3)

Answer 14

1) Medial pectoral nerve
2) Medial cutaneous nerve of arm
3) Medial cutaneous nerve of forearm

Question 15

Branches from Ventral Rami (2)

Answer 15

1) Dorsal scapular nerve

2) Long thoracic nerve (nerve to serratus anterior)

Question 16

Branches from Upper Trunk (2)

Answer 16

1) Suprascapular nerve

2) Nerve to subclavius