Shoulder joint Flashcards
Superior muscles of the shoulder joint
Deltoid, Supraspinatus
Posterior muscles of the shoulder joint
Infraspinatus, Teres minor
Anterior muscles of the shoulder joint
Subscapularis, Pectoralis major, Coracobrachialis, Biceps brachii (stability)
Inferior muscles of the shoulder joint
Latissimus dorsi, Teres major,
Long head of Triceps brachii (stability)
Function of the deltoid
POWERFUL abductor
Functions of middle deltoid
abduction
functions of the anterior deltoid
Abduction
Flexion
Horizontal adduction
Internal rotation
Functions of supraspinatus
Weak abduction -(Works with deltoid)
Weak flexion
Stabilizes GH joint
2 Facts about supraspinatus
Important dynamic stabilizer in throwing
Most often injured of rotator cuff muscles
Motions of the infraspinatus
External rotation —Most powerful
Horizontal abduction
Extension
3 facts about the infraspinatus
Maintains posterior stability of humeral head in fossa
Effective when rhomboids stabilize scapula
2nd most injured rotator cuff muscle
motions of the teres minor
External rotation
Horizontal abduction
Extension
functions of the teres minor
Stabilizes humeral head in glenoid fossa
Functions similarly to infraspinatus; same actions
Motions of the subscapularis
Internal rotation
Adduction
Extension
Functions of the subscapularis
Stabilization of GH joint
Provides anterior and inferior stability