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Trunk Muscles
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Gravity
Terms in this set (11)
Pectoralis Major
forms the anterior wall of the axilla and acts to adduct and flex the arm
Intercostaal Muscles
Deep muslces found between the ribs; external raise the rib cage when you inhale; internal move air out of the lungs when you exhale forcibly
Rectus Abdominis
flex the vertebral column; compress the abdominal contents during defecation and childbirth; forced breathing
External Oblique
Flex the vertebral column; rotate the trunk and bend it laterally
Internal Oblique
Same as external
Transversus Abdominis
Compresses the abdominal contents
Trapezius
Extend the head; elevate, depress, adduct, and stabalize the scapula
Latissimus Dorsi
Extends and adducts the humerus; for when the arm is brought down in a power stroke
Erector Spinae
Prime mover of back extension; Provide resistance that helps control the action of bending over at the waist
Quadratus Lumborum
Flexes the spine laterally singularly; Together extend the lumbar spine
Deltoid
Prime movers of arm abduction
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