Shoulder Flashcards
what type of joint is the shoulder
ball and socket synovial joint
what forms the shoulder joint
humeral head and scapular glenoid
what forms the shoulder girdle
scapula, clavicle, proximal humerus and supporting muscles (deltoid and rotator cuff muscles)
what provides stability to the shoulder joint due to lack of inherent bony stability
musculature in particular rotator cuff
wha muscles form the rotator cuff
supraspinatus, infraspinatus, subscapularis, teres minor
what do the rotator cuff muscles do
hold humeral head in place and provide essential movements
what muscles attach to the greater tuberosity
supraspinatus, infraspinatus and teres minor
what movement is the supraspinatus responsible for
initiating abduction
what movement are the infraspinatus and teres minor responsible for
external rotators
what muscle attaches to the lesser tuberosity
subscapularis
what movement is the subscapularis responsible for
internal rotation
what are all 4 rotator cuff muscles responsible for collectively
pulling humeral head into glenoid providing a stable fulcrum for deltoid muscle to abduct arm
