Scapulohumeral Muscles (Intrinsic shoulder) Flashcards
Muscles of Rotator Cuff
supraspinatus
infraspinatus
teres minor
subscapularis
Greater Tubercle 3 Facets
Superior, middle, and inferior
how many facets are on the lesser tubercle
1
Origin of supraspinatus
supraspinatus fossa of scapula
insertion of supraspinatus
greater tubercle of humerus (superior facet)
action of the supraspinatus
abduct humerus
stabilize shoulder joint
Infraspinatus origin
infraspinatus Fossa of scapula
insertion of infraspinatus
greater tubercle of humerus
- middle facet
infraspinatus action
laterally rotate humerus and stabilize shoulder joint
Teres Minor Origin
lateral border of scapula
Insertion of Teres Minor
greater tubercle of humerus
- inferior facet
Actions of the teres minor
laterally rotate humerus
stabilize shoulder joint
subscapularis origin
subscapular fossa of scapula
subscapularis insertion point
lesser tubercle of humerus
actions of the subscapularis
medially rotate humerus
and stabilize shoulder joint
Insertion of Deltoid
Deltoid tuberosity of humerus
Origin of deltoid
lateral third of clavicle, acromion of scapula, and spine of scapula
action of the anterior deltoid
flex humerus and medially rotate humerus
middle deltoid action
abduct humerus
posterior deltoid action
extend humerus and laterally rotate humerus
Teres Major origin
lateral border of scapula - inferior aspect
Teres Major Insertion
intertubercular groove of humerus - medial lip
Action of teres major
adduction of humerus
medial rotation of humerus
