posterior body

trapezius

Origin- Occipital bone, vertebra,

Insertion- Scapula (acromion, spine),

Action- Elevates skull, scapula

trapezius O, I, A

latissimus dorsi

Origin- Lumbar vertebrate, iliac crest,

Insertion- Humerus,

Action- Adduction of the humerus, think Lat pulldowns

latissimus dorsi O, I, A

infraspinatus

teres minor

teres major

rhomboid major

rhomboid minor

longissmus thoracis or erector spinae group

serratus posterior inferior

spikes

infraspinatus

teres minor

teres major