Muscles of the Chest

Question 1

Pectoralis Major (Origin & Insertion)

Answer 1

O: Proximal half of clavicle (clavicular head) & sternum costal cartilage 1-6 (sternal head)
I: Lat lip of bicipital sulcus of humerus

Question 2

Pectoralis Major (Actions)

Answer 2

Prime mover for aduction & internal rotation of the shoulder
Clavicular head flexes shoulder
I/O expands ribcage

Question 3

Pectoralis Major (Nerve & Artery)

Answer 3

N: Lateral & medial pectoral Nn
A: Thoracoacromial A

Question 4

Pectoralis Minor (Origin & Insertion)

Answer 4

O: ribs 3-5
I: Coracoid process of scapula

Question 5

Pectoralis Minor (Actions)

Answer 5

Depresses & protracts scapula
Rotates scapula down
I/O expands ribcage

Question 6

Pectoralis Minor (Nerve & Artery)

Answer 6

N: Medial pectoral N
A: Thoracoacromial A

Question 7

Subclavius (Origin & Insertion)

Answer 7

O: Junction of 1st rib & costal cartilage
I: Inf central clavicle

Question 8

Subclavius (Actions)

Answer 8

Depresses & protracts clavicle

Question 9

Subclavius (Nerve & Artery)

Answer 9

N: Subclavian N
A: Thoracoacromial A