- See:
Rotator Cuff Tear:
- Discussion:
- see
abductors of the shoulder;
- common tendon covering top, front, & back of humeral head;
- 4 muscles fuse to form this tendon: (
subscapularis,
supraspinatus,,
infraspinatus,
teres minor;)
-
supraspinatus
- lies directly over top of humeral head & is an
abductor;
- it is predisposed to degenerative changes because of its location between humeral head & acromion, which compress tendon during
shoulder movement (see
impingement)
-
infraspinatus &
teres minor - cover back of humeral head & are
external rotators;
-
subscapularis: crosses front of
shoulder joint, is
internal rotator and reinforces anterior capsule;
- innervation:
- supraspinatus & infraspinatus are supplied by the
suprascapular nerve;
- teres minor is supplied by
axillary nerve;
- subscapularis is supplied by
subscapular nerve;
- blood supply:
- blood supply to the rotator cuff is derived from 6 arteries;
-
anterior humeral circumflex
- is major supplier to anterior cuff & long head of the biceps;
-
postrior humeral circumflex
- along w/ suprascapular branch supplies the posterior cuff;
- suprascapular
-
thoracoacromial arteries
- supplies the supraspinatus
- suprahumeral
-
subscapular
Humeral Insertion of the Supraspinatus and Infraspinatus. New Anatomical Findings Regarding the Footprint of the Rotator Cuff
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