Anterior Thoracoappendicular Muscles Innervated by C5-T1, anterior (ventral) primary rami

Question 1

Pectoralis Major

Answer 1

O-Clavicle, sternum, and upper 6 costal cartilage
I-Lateral lip of intertubercular sulcus of humerus
N-Medial and Lateral pectoral nerves
A-Adducts and medially rotates humerus; clavicular fibers flex humerus

Question 2

Pectoralis Minor

Answer 2

O-3rd, 4th, and 5th ribs
I-Coracoid process of the scapula
N-Medial pectoral nerve (only one nerve)
A-Stabilizes scapula by drawing it inferiorly and anteriorly (protraction and depression)

Question 3

Subclavius

Answer 3

O-Junction of the 1st rib and cartilage
I-Inferior surface of clavicle
N-Nerve to subclavius
A-Not much- depresses and anchors the clavicle

Question 4

Serratus Anterior

Answer 4

O-First 8 ribs
I-medial border of scapula
N-Long thoracic nerve
A-Draws scapula forward (protracts and depresses) around thoracic wall, rotates glenoid fossa superiorly