Axilla & Pectoral Region Muscles

Question 1

What makes up the Deltopectoral (clavipectoral) Triangle

Answer 1

Cephalic vein
Deltoid branch of Thoracoacromial artery
Pectoralis major

Question 2

Pectoralis major

Answer 2

Adducts Humerus
Medially rotates humerus
Draws scapula anteriorly & inferiorly (via clavicle)
Flexes humerus (Clavicular portion)
Extends humerus from flexed position (Sternal portion)

Lateral pectoral nerves
Medial pectoral nerves

Question 3

Pectoralis minor

Answer 3

Stabilizes scapula - by pulling it anteriorly & inferiorly against posterior thoracic wall

Medial pectoral nerve

Question 4

Subclavius

Answer 4

Anchors & depresses clavicle

Nerve to subclavius

Question 5

Serratus anterior

Answer 5

Protracts scapula
Rotates scapula
Holds scapula against thorax

Long thoracic nerve

Question 6

If the medial border of the scapula is protruding abnormally which nerve is most likely damaged?

a. Nerve to subclavius
b. Medial pectoral nerve
c. Lateral pectoral nerve
d. Long thoracic nerve

Answer 6

d. Long thoracic nerve

It innervates serratus anterior, which holds the scapula against the thorax

Question 7

Boundaries of Axilla

Answer 7

Apex
Base
Anterior wall
Posterior wall
Medial wall
Lateral wall