Major muscle groups

The rotator cuff

Teres Minor

The teres minor is a muscle that helps to laterally rotate the arm and slightly helps to adduct the arm.

The origin of this muscle is the middle border of the scapula.

the insertion of this muscle is the inferior aspect of the humerus

Infraspinatus

the infraspinatus is another muscle in the rotator cuff that helps to laterally rotate the arm. It also helps to stabalize the shoulder joint.

The origin of this muscle is the infraspinous of the scapula

The inssertion of the muscle is the middle facet of the greater tubercle of the humerus

Supraspinatus

the supraspinatus helps the deltoid muscle initiate the abduction of the arm at the shoulder joint.

The origin of this muscle is the supraspinous fossa of the scapula.

The insertion of this muscle is the superior aspect of the greater tubercle of the humerus

Subscapularis

the subscapularis is also found as part of the rotator cuff group its role is to help rotate the shoulder and also to stabalise the shoulder joint.

The origin of this muscle is the anterior side of the scapula

The inssertion of this muscle is humerus

S.I.T.S

S - upraspinatus

I - infraspinatus

T -eres minor

s - ubscapularis

Rotator Cuff Anatomy Tutorial for BarreConcept