Chapter 10 - Muscles that Move the Scapula and Arm
Draws scapula forward and down
- Moves scapula upwards, out (abduction) and forward.
- “boxers muscle”
Stabilizes, raises (shrug shoulder), retracts (adduct), rotates scapula. Also extend head and neck
Elevates/adducts the scapula
Rhomboids (Major & Minor)
Retracts, adducts and depresses scapula (moves scapula back, together, and down) like downward motion of paddling a canoe
Prime mover of arm flexion and adduction; rotates forearm medially;
Can help in climbing, throwing, and pushing
Prime mover of arm extension and adduction;
M edially rotates arm at shoulder.
Bringing the arm down in a power stroke (striking a blow, hammering, swimming, and rowing)
Prime mover of arm abduction when all fibers active
Front fibers: arm flexion. Back fibers: arm extension. (arms during walking)
List the Rotator Cuff Muscles
Rotator Cuff Muscles
Main function is to Reinforce the capsule of the shoulder joint to prevent dislocation of the humerus.
Sports that involve a lot of shoulder rotation put these muscles under stress à pitching, bowling, swimming
Extends, adducts, and medially rotates humerus
synergist of latissimus dorsi