Ant Thoracic Wall O/I/A

Question 1

Pectoralis major

Answer 1

O: sternum, clavicle, rubs 1-6
I: greater tubercle
A: flexes/ medially rotates
, adducts, horizontally adducts and flexes arm

Question 2

Pectoralis minor

Answer 2

O: ribs 3-5
I: coracoid process
A: protracts, depresses, and downwardly rotates scapula

Question 3

Subclavius

Answer 3

O: costal cartilage of rib 1
I: clavicle
A: stabilizes and depresses pectoral girdle

Question 4

Serratus anterior

Answer 4

O: ribs 1-8
I: vertebral border of scapula
A: protracts and upwardly rotates scapula