Pectoral Region, Axilla, and Anterior Compartment of the Arm

Question 1

Pectoralis major
Blood supply:
Nerve Supply:
Action:

Answer 1

Blood supply: thoracoacromial artery
Nerve Supply: Lateral + medial pectoral
Action: Adduct, medially rotate and flex the arm

Question 2

Pectoralis minor
Blood supply:
Nerve Supply:
Action:

Answer 2

Blood supply: Thoracacromial artery
Nerve Supply: Medial pectoral nerve
Action: Protract and depress the scapula

Question 3

Subscapularis
Blood supply:
Nerve Supply:
Action:

Answer 3

Blood supply: Subscapularis artery
Nerve Supply: Subscapular nerve
Action: Adduct and medially rotate the scapula upward

Question 4

Serratus anterior
Blood supply:
Nerve Supply:
Action:

Answer 4

Blood supply: Lateral thoracic artery
Nerve Supply: Long thoracic artery
Action: Protract and rotate the scapula upward

Question 5

Biceps brachii (Short and Long Head)
Blood supply:
Nerve Supply:
Action:

Answer 5

Blood supply: Brachial Artery
Nerve Supply: Musculocutaneous nerve
Action: Flex arm. Flex and supinate the forearm

Question 6

Coracobrachialis
Blood supply:
Nerve Supply:
Action:

Answer 6

Blood supply: Brachial Artery
Nerve Supply: Musculocutaneous nerve
Action: Flex and adduct the arm

Question 7

Brachialis
Blood supply:
Nerve Supply:
Action:

Answer 7

Blood supply: Brachial artery
Nerve Supply: Musculocutaneous nerve
Action: Flex forearm

Question 8

What superficial vein travels through the deltopectoral triangle to drain into the axillary vein?

Answer 8

Cephalic vein

Question 9

What artery does the long thoracic nerve travel with along the rib cage?

Answer 9

Lateral thoracic artery

Question 10

What nerve does the posterior humeral circumflex artery travel with to the quadrangular space?

Answer 10

Axillary nerve

Question 11

What nerve innervates the muscles in the anterior compartment of the arm?

Answer 11

Musculocutaneous

Question 12

The brachial artery will split into what two arteries at the level of the elbow?

Answer 12

Ulnar and Radial artery

Question 13

Describe the cephalic vein

Answer 13

Run in deltopectoral groove (between the 2 respective muscles). Drains into axillary vein.

Question 14

Name the 4 walls of the axilla

Answer 14

Anterior: Pec major and minor
Lateral = humeral joint
Medial: serratus anterior
Posterior: Teres major, subscapularis, latissimus dorsi