Rotator Cuff Muscles Flashcards
Supraspinatus origin
Supraspinous fossa
Supraspinatus insertion
Superior portion of the greater tubercle of the humerus
Supraspinatus Nerve
Suprascapular Nerve
Supraspinatus Blood supply
suprascapular artery
Supraspinatus action
initiation of abduction of the humerus(needs the deltoid to fully abduct the humerus)
Infraspinatus origin
Infraspinous fossa
Infraspinatus insertion
Posterior part of greater tubercle of humerus (inferior)
Infraspinatus nerve
Suprascapular Nerve
Infraspinatus Blood supply
suprascapular artery
Infraspinatus action
Shoulder external rotation and some adduction
Teres minor origin
Bottom 2/3 of lateral border of scapula
Teres Minor insertion
Posterior greater tubercle inferior to infraspinatus
Teres Minor Nerve
Axillary Nerve
Teres Minor Blood supply
circumflex scapular artery and suprascapular artery
Teres minor action
shoulder external rotation and some addiction
Subscapularis is the most powerful ______
Internal rotator of the shoulder
Subscapularis origin
Subscapular fossa
Subscapularis insertion
Lesser tubercle of the humerus
Subscapularis Nerve
Upper and lower subscapular Nerve
Subscapularis Blood supply
Subscapularis artery (splits into thoracodorsal and circumflex scapular arteries
Which rotator cuff muscle doesn’t cause rotation?
Supraspinatus
If a muscle inserts on the anterior humerus what kind of rotation does it do?
medial/internal
If a muscle inserts on the posterior humerus, what kind of rotation does it perform?
Lateral/external
