Muscles of the trunk/arm

Rectus abdominis

A major spine flexor

Lattisimus dorsi

Prime mover for pulling the arm posteriorly

Pectoralis major

Prime mover for shoulder flexion

External/internal oblique

Partly forms the abdominal girdle

Transverse abdominus

Partly forms the abdominal girdle

Pectoralis minor

Pulls the shoulder backward and downward

Deltoid

Prime mover of shoulder abduction

Pectoralis major/Latissimus dorsi

Importand in shoulder adduction and antagonists of the shoulder abductor

Serratus anterior

Moves the scapula forward and downward

External intercostals

Small, inspiratory muscles between the ribs; elevates the ribs

Trapezius

Extends the head

Rhomboids

Pulls the scapulae medially