trapezius
enables you to shrug your shoulders and extend your head; elevates, stabilizes, and depresses the scapulae
latisimus dorsi
adducts the shoulder and causes extension of shoulder joint
deltoid
antagonist of latisimus dorsi
erector spinae
prime mover of back extension; composite muscle consisting of 3 columns
quadratus lambordum
fleshy muscle forming part of the posterior abdominal wall that helps to maintain upright posture
rhomboids
rotate the glenoid cavity of the scapulae inferioirly; square shoulders as they act to retract the scapula
levator scapulae
synergist of the trapezius in scapular elevation; act to flex the head to the same side
teres major
synergist of latissimus dorsi in extension and adduction of the humerous
supraspinatus
rotator cuff muscle; prevents downward dislocation of the humerous
infraspinatus
rotator cuff muscle; rotates humerous laterally
teres minor
rotator cuff muscle; lies immediately inferior to the infraspinatus
serratus anterior
holds scapula tightly against thorax wall