Trunk Muscles

Infraspinatus

As one of the four muscles of the rotator cuff, the main function is to externally rotate the arm and stabilize the shoulder joint.

Pectoralis Major

a thick, fan-shaped muscle, situated at the chest (anterior) of the body. It makes up the bulk of the chest muscles in the male and lies under the breast in the female.

supraspinatus

is a relatively small muscle of the upper arm that runs from the supraspinatous fossa superior of the scapula (shoulder blade) to the greater tubercle of the humerus.

Latissimus dorsi

is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region.

Rectus Abdominus

known as the "six pack", is a paired muscle running vertically on each side of the anterior wall of the human abdomen

Trapezius

large superficial muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula

Subscapularis

large triangular muscle which fills the subscapular fossa and inserts into the lesser tubercle of the humerus and the front of the capsule of the shoulder-joint.

Internal oblique

lying just underneath the external oblique and just above (superficial to) the transverse abdominal muscle.

transverse abdominis

muscle layer of the anterior and lateral abdominal wall which is deep to (layered below) the internal oblique muscle

teres major

muscle of the upper limb and one of six scapulohumeral muscles.

External oblique

muscle whose fibers are oblique in relation to the body when it is standing

teres minor

narrow, elongated muscle of the rotator cuff

Rhomboideus Major

on the back that connects the scapula with the vertebrae of the spinal column

Serratus anterior

originates on the surface of the upper eight or nine ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula.

Levator

situated at the back and side of the neck. As the name suggests, its main function is to lift the scapula.

Pectoralis Minor

thin, triangular muscle, situated at the upper part of the chest, beneath the pectoralis major.