muscles of thorax Flashcards by Chris Whalen | Brainscape

Q

pectoralis major origen

A

clavicle, sternum, costal cartilage of ribs 1-6

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Q

pectoralis major insertion

A

intertubricular groove of humerus

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Q

pectoralis major action

A

ADduct shoulder, flexion, medial rotation

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Q

pectoralis major nerve suply

A

medial and lateral pectoral nerves

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Q

pectoralis minor origen

A

ribs 3-5

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Q

pectoralis minor insertion

A

caracoid process of scapula

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Q

pectoralis minor action

A

depress scapula, elevate ribs

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Q

pectoralis minor nerve suply

A

medial pectoral nerve

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Q

serratus anterior origen

A

ribs 1-8

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Q

serratus anterior insertion

A

medial border of scapula

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Q

serratus anterior action

A

protracts scapula

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Q

serratus anterior nerve suply

A

long thoracic nerve

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Q

EXTERNAL intercostal origen

A

inferior border of rib

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Q

EXTERNAL intercostal insertion

A

superior border of rib

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Q

EXTERNAL intercostal action

A

elevate ribs

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Q

EXTERNAL intercostal nerve supply

A

intercostal nerve

Q

INTERNAL intercostal origen

A

superior border of rib

Q

INTERNAL intercostal insertion

A

inferior border of rib

Q

INTERNAL intercostal action

A

depresses ribs

Q

INTERNAL intercostal nerve supply

A

intercostal nerves

Q

in what direction do the muscle fibers of EXTERNAL intercostal muscles go?

A

down and in (I to O pulls rib up)

Q

in what direction do the muscle fibers of INTERNAL intercostal muscles go?

A

down and out (I to O pulls rib down)