Anterior pectoral girdle

Question 1

Pectoralis Major

Answer 1

O: (Clavicular) anterior aspect, medial 1/2 of clavicle
(Stenocostal) manubrium, sternal body, true ribs & their costal cartilage
(Abdominal) external abdominal oblique aponeurosis
I: Crest of greater tubercle of humerus
A: Adduction, internal rotation, horizontal adduction. (also assists in humeral flexion, extension. Depresses shoulder girdle)
N: Medial & lateral pectoral n.

Question 2

Pectoralis Minor

Answer 2

O: Anterior ends ribs 3-5
I: coracoid process
A: Protraction, medial rotation of scapula
N: Medial & lateral pectoral n.

Question 3

Subclavius

Answer 3

O: Superior surface of costal end of 1st rib
I: Interior surface of middle 1/3 of clavicle
A: Stabilize clavicle
N: Subclavian n.

Question 4

Serratus Anterior

Answer 4

O: External surface of ribs 1-9
I: Medial border of scapula
A: Protraction, lateral rotation of scapula
N: Long thoracic n.