Anterior Axio-Appendicular Muscles

Question 1

Pectoralis major (clavicular/sternocostal head)

Answer 1

adducts and medially rotates shoulder joint, draws scapula anteriorly and inferiorly
acting alone, clavicular head flexes shoulder joint and sternocostal head and extends it from the flexed position
nerve supply - lateral and medial pectoral nerves

Question 2

Pectoralis minor

Answer 2

stablilizes scapula by drawing inferiorly and anteriorly against thoracic wall
nerve supply - medial pectoral nerve
3rd-5th ribs near their costal cartilages -> medial border and superior surface of coracoid process of scapula

Question 3

Subclavius

Answer 3

anchors and depresses clavicle
nerve supply - subclavian nerve
junctio of 1st rib and its costal cartilages -> inferior surface of middle third of clavicle

Question 4

Serratus anterior

Answer 4

protracts scapula and holds it against thoracic wall; rotates scapula
nerve supply - long thoracic nerve
external surface of lateral parts of 1st-8th ribs -> anterior surface of medial border of scapula