Pectoral Muscles

Question 1

Pectoralis Major

Answer 1

O: clavicular head= ant surface of sternal clavical
sternocostal= ant sternum and 6 costal cartilages

I: common tendon to inter tubercular groove

A: A44 and internally rotates humerus; clavicular= flexes humerus; sternocostal= extends humerus

N: Lateral (C5, 6) and medial (C7, C8, T1) pectoral nerves

Question 2

Pectoralis Minor

Answer 2

O: ribs 3-5

I: medial border and superior coracoid process

A: stabilizes scapula; minor protractor

N:medial pectoral n. (C8, T1)

Question 3

Subclavius

Answer 3

O: junction of rib 1 and costal cartilage

I: inf. surface of mid 1/3 clavicle

A: draws clavicle medially

N: nerve to subclavius (C5, 6)

Question 4

Serratus Anterior

Answer 4

O: external first 8 ribs; fascia over intercostal muscles

I: anterior medial border of scapula

A: protraction of scapula; holds scapula; upward rotation of scap

N: long thoracic n. (C5, 6, 7)