Shoulder muscles Flashcards
(54 cards)
anterior muscles of shoulder
pec maj, subscap, coracobrachialis, and biceps brachi
posterior shoulder muscles
infraspinatus and teres minor
superior shoulder muscles
deltoid and supraspinatus
inf shoulder muscles
lats, teres major, and long head of triceps brachii
Pec major muscle action
prime mover of add, h add, and internal rot of humerus
shape of pec major
triangular
pec major origin
along medial clavicle and sternum
pec major insertion
intertubercular groove of humerus
pec maj clav portion muscles action
flex humerus
pec majr sternocostal portion extends
humerus from flexed position
coracobrachialis assist w/ what muscle actions
shoulder flexion and add
biceps brachii is what kind of jt and how many head muscle that crosses what?
The biceps is a 2-jt, 2 head muscle that corsses the shoulder and elbow
all 3 heads of deltoid insertions?
All heads insert @ deltoid tuberosity on lateral humerus
ant delt origin
anterolateral aspect of clavicle
ant delt is chiefly responsible for what muscle actions?
shoulder flexion, h add, and IR of GH jt
midd delt origin
lateral aspect of acromion
midd delt muscle action
abd of GH Jt
post delt origin
inferior aspect of scapular spine
post delt muscle action
GH ext, h abd, and ER, oppose ant delt
Which deltoid is usually more dvp’d ? Cuases what?
Ant more dvp’d than post delt causing imbalance.
Post under dvp than ant delt is imbalance that causes what?
postural abnormalities (shoulder fwd and IR) and may be related to shoulder problems such as shoulder impingement syndrome
What 4 muscles make up rotator cuff?
Subscap, Infraspinatus, Teres minor, and supraspinatus
rotator cuffs insertion
greater and lesser tubercles of humerus
rot cuffs origin
scapula
