Unit 2 - Upper Limb: Subclavius, Pectoralis Minor, and Serratus Anterior (Ex. II)

Question 1

pectoralis minor

Answer 1

O: ribs 3-5
I: coracoid process of scapula
Inn: M pectoral N (C8, T1)
A: depresses scapula, causing I angle to move P-M; rotates glenoid cavity I; assists in respiration

Question 2

S serratus anterior

Answer 2

O: ribs 1-9
I: vertebral border of scapula
Inn: long thoracic N (C5-C7)
A: lowers raised arm

Question 3

intermediate serratus anterior

Answer 3

O: ribs 1-9
I: vertebral border of scapula
Inn: long thoracic N (C5-C7)
A: protraction of scapula; elevates ribs when shoulder is fixed

Question 4

I serratus anterior

Answer 4

O: ribs 1-9
I: vertebral border of scapula
Inn: long thoracic N (C5-C7)
A: L rotates scapula

Question 5

action of serratus anterior as a whole

Answer 5

protracts scapula; elevates ribs when shoulder is fixed

Question 6

subclavius

Answer 6

O: 1st rib
I: I surface of clavicle
Inn: N to subclavius (C5, C6)
A: steadies clavicle in SC joint