Anatomy 101 Thorax Muscles Functions Flashcards

1
Q

pectoralis major action

A

flexes and adducts arm
rotates arm medially

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2
Q

pectoralis minor action

A

protracts and depresses scapula

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3
Q

serratus anterior action

A

protracts scapula
assists in upward rotation of scapula

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4
Q

diaphragm action

A

flattens to lower floor of thoracic cavity to increase volume, decrease pressure, causing inspiration

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5
Q

external intercostals action

A

elevates rib cage
spreads ribs apart
assists in inspiration

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6
Q

internal intercostals action

A

depresses rib cage
pulls ribs closer
assists in expiration

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