Muscles

Thorax Posterior Aspect:
Trapezius
Location:base of head across scapula spine
Motion: Scapula Elevation and Retraction

Latissismus Dorsi:
Location:Posterior mid to lower back
Motion:Extends and IR arm depresses shoulder girdle

Rhomboids
*shaped rectangular*
Location:vertebral column to medial border of scapula
Minor - smaller (superior)
Major - larger (inferior)
Motion: Scapula retraction

Teres Major
Location:Proximal end of humerous to inferior angle of scapula
Motion:shoulder extension