Rotator Cuff Muscles (week 8)

Supraspinatus origin

supraspinatus fossa of scapula

Supraspinatus insertion

greater tubercle of humerus

Supraspinatus actions

abduct and stabilize shoulder @ GH joint

Infraspinatus origin

Infraspinous fossa of scapula

Infraspinatus insertion

greater tubercle of humerus

Infraspinatus actions

laterally rotate

adduct

stabilize

@ GH joint

What is Infraspinatus’ synergist?

Teres Minor

Teres Minor origin

upper 2/3 lateral border of scapula

Teres Minor insertion

greater tubercle of humerus

Teres Minor actions

laterally rotate

adduct

stabilize

@ GH joint

Subscapularis origin

subscapular fossa of scapula

Subscapularis insertion

lesser tubercle of humerus

Subscapularis actions

medially rotate and stabilize @ GH joint

What is the largest rotator cuff muscle?

Subscapularis