Pectoralis Minor
Draws scapula forward and down
Serratus Anterior
- Moves scapula upwards, out (abduction) and forward.
- “boxers muscle”
Trapezius
Stabilizes, raises (shrug shoulder), retracts (adduct), rotates scapula. Also extend head and neck
Levator Scapulae
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
“squaring shoulders”
Pectoralis Major
Prime mover of arm flexion and adduction; rotates forearm medially;
Can help in climbing, throwing, and pushing
Latissimus Dorsi
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)
Deltoid
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
Supraspinitus
Infraspinitus
Teres Minor
Subscapularis
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
Teres Major
Extends, adducts, and medially rotates humerus
synergist of latissimus dorsi