Gross muscle physiology; trunk shoulder and arm

4 important questions on Gross muscle physiology; trunk shoulder and arm

Erector spinae help

spinal column extension

Quadratus lumborum  help

flex the spine laterally

Muscles that cross the shoulder joint into the humerus include

pectoralis major
latissmus dorsi
deltoid
rotator cuff group
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Iliocostalis, longissimus and spinalis are a part of the

erector spinae

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