Anatomy 101 Thorax Muscles Functions Flashcards
1
Q
pectoralis major action
A
flexes and adducts arm
rotates arm medially
2
Q
pectoralis minor action
A
protracts and depresses scapula
3
Q
serratus anterior action
A
protracts scapula
assists in upward rotation of scapula
4
Q
diaphragm action
A
flattens to lower floor of thoracic cavity to increase volume, decrease pressure, causing inspiration
5
Q
external intercostals action
A
elevates rib cage
spreads ribs apart
assists in inspiration
6
Q
internal intercostals action
A
depresses rib cage
pulls ribs closer
assists in expiration
