Brachial Plexus

Question 1

Musculocutaneous Nerve

Answer 1

Pierces Coracobrachialis

Question 2

Axillary Nerve

Answer 2

Leaves Axilla First

Deltoid and Teres Minor

Question 3

Radial Nerve

Answer 3

Arm: Spirals around humerus in a medial to lateral fashion posteriorly

Elbow: Deep to brachioradialis, anterior to lateral epicondyle

Splits to superficial branch of the radial nerve and deep branch of the radial nerve.

Superficial branch spirals around brachioradialis tendon and goes to the hand for sensation.

Deep branch pierces the supinator then goes to innervate all of the posterior forearm

Question 4

Ulnar Nerve

Answer 4

Arm: Medial biccipital groove proximally then between the medial head and the long head of the triceps

Elbow: between the medial epicondyle and the olecranon process
Forearm: between flexor carpi ulnaris and ulnar 1/2 of flexor Digitorum Profundus

Wrist: lateral to flexor carpi ulnaris to ulnar tunnel

Hand, motor and sensory

Question 5

Median Nerve

Answer 5

Arm: Medial biccipital groove following brachial artery and veins

Elbow: in cubical fossa, halfway between biceps tendon and medial epicondyle

Forearm: between Digitorum muscles (FDP and FDS)

Wrist: Deep to Pollicis Longus and superficial to flexor digitorum superficialis to carpal tunnel

To hand for sensation (5/18)

Question 6

Pectoral Nerve

Answer 6

Pectoralis Major and Pectoralis Minor

Question 7

Long Thoracic Nerve

Answer 7

Serratus Anterior

Question 8

What is the Trapezius innervated by?

Answer 8

Cranial Nerve XI and Ventral Rami of C3 and C4 (Cervical Plexus)

Question 9

Thoracodorsal Nerve

Answer 9

Latissimus Dorsi

Question 10

What innervates the Levator Scapulae and Rhomboids?

Answer 10

Brachial Plexus

Question 11

Subscapular Nerve

Answer 11

Teres Major and Subscapularis

Question 12

What does the Musculocutaneous Nerve Innervate?

Answer 12

Anterior Compartment of Arm

Question 13

What does the Median Nerve Innervate?

Answer 13

1. 3 Thenars (APB, FPB, and OP)
2. 2 Lateral Lumbricals
3. Anterior Compartment of Forearm except Flexor Carpi Ulnaris and 1/2 of Flexor Digitorum Profundus (ulnar/medial 2 tendons)

Question 14

What does the Ulnar Nerve Innervate?

Answer 14

1. Flexor Carpi Ulnaris
2. 1/2 of FDP (ulnar/medial 2 tendons)
3. Anterior Compartment of Hand except 3 Thenars (APB, FPB, and OP) and 2 Lateral Lumbricals

Question 15

What does the Radial Nerve Innervate?

Answer 15

Posterior Compartment of Arm and Forearm

Question 16

What does the Axillary Nerve Innervate?

Answer 16

Deltoid and Teres Minor