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Muscles thatMove thePectoral Girdle

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hese muscles can be grouped into thenterior muscles the move the pectoralirdle and the posterior muscles .

he muscles stablize the pectoral girdle sohat it can serve as a stable platform on whichhe humerus can move.

hese muscles will also adjust the position ofhe pectoral girdle and particularly thecapula to allow for a wider range of

movements for the humerus.

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The anterior muscles are the

,and the

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Subclavius, Pectoralis MinorandSerratus nterior

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The posterior muscles are the

,, and.

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Trapezius, levator scapulae,!homboideus major and!homboideus minor

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Pectoralis Minor

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Muscle" Pectoralis minor

#rigin" $entral surfaces of ribs%&'

nsertion" Scapula

ction" )epresses and protracts

houlder, rotates scapuladownward, elevates ribs

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Serratusanterior

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Muscle" Serratus anterior

#rigin" nterior and superiormargins of ribs *&+

(nsertion" Scapula

ction" Protracts shoulder androtates scapula upward

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evator scapulae

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Muscle" evator scapulae

#rigin" -irst cervicle vertebrae

(nsertion" Scapula

ction" /levates scapula

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!homboideus major

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Muscle" !homboideus major

#rigin" Spines of T0 &T'

(nsertion" Scapula

ction" adducts scapula and

rotates it downward

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!homboideus Minor

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Muscle" !homboideus minor

#rigin" Spines of 12 and T*

(nsertion" Scapula

ction" adducts scapula and

rotates it downward

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Subclavius

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Muscle" Subclavius

#rigin" -irst rib

(nsertion" 1lavicle

ction" )epresses and

protracts shoulder

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Trapezius

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Muscle" Trapezius

#rigin" #ccipital bone,ligamentum nuchae, spinousprocesses of thoracic vertebrae

(nsertion" 1lavicle and scapula

ction" May elevate, retract,depress, or rotate scapulaupward3 elevate clavicle3 e4tendnec5

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(nsertion at the Scapula"

*.

0.

%.

.

'.

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Pectoralis minor

Serratus anterior

evator scapulae

!homboideus major

!homboideus minor

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(nsertion at the 1lavicle andscapula

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Trapezius

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(nsertion at 1lavicle

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Subclavius

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ction" )epresses andprotracts shoulder

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Subclavius

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ction" )epresses and protractsshoulder, rotates scapuladownward, elevates ribs

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Pectoralis minor

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ction" Protracts shoulder androtates scapula upward

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Serratus anterior

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ction" May elevate, retract,depress, or rotate scapulaupward3 elevate clavicle3e4tend nec5

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Trapezius

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/levates scapula

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evator scapulae

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adducts scapula and rotates itdownward

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!homboideus minor

!homboideus major

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Trapezius

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!homboidus Major!homboidus Minor

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!homboidus Major!homboidus Minor

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Pectoralis Minor

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evator Scapulae

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Subclavius

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Subclavius