Teres Major Teres major works closely with latissimus dorsi in adducting and extending the humerus. The lateral portion of latissimus dorsi usually twists around teres major and lives in the same fascial sheath. Latissimus, in a minority of times, also attaches to the inferior scapula. Origin – the posterior, inferior edge of the lateral border of the scapula …
Rotator Cuff Muscles Origin – scapula Insertion – head of the humerus Function – Stabilize, rotate and adduct the humerus Related sections of the website: Wikipedia entry for rotator cuff muscles. Tony Preston has a practice in Atlanta, Georgia where he sees clients. He has written and taught about anatomy, trigger points and cranial therapies since …
Infraspinatus is a flat rotator cuff muscle located in the infraspinous fossa of the scapula. Origin: infraspinous fossa Insertion: posterior greater tubercle of the humerus Function: stabilize the humeral head, externally rotate the humerus Innervation: C4-C6, Brachial Plexus, Suprascapular nerve Wikipedia entry for Infraspinatus
Subscapularis The subscapularis muscle is thick with multiple bellies on the underside of the scapula. Its tendon is separated from the joint capsule by a bursa. It can be a key player in frozen shoulder and pitching restrictions. Origin: subscapular fossa Insertion: lesser tubercle of the humerus Function: stabilization of the humeral head, internal rotation of the …
Teres minor is a rotator cuff muscle that extends along the back of the axilla. Origin – lateral border of the posterior scapular surface Insertion – Lower posterior greater tubercle of the humerus Function – stabilize and laterally rotate the head of the humerus. Seems to contract with the same timing and intensity as infraspinatus. …
Supraspinatus Supraspinatus is a rotator cuff muscle located on the superior aspect of the scapula. Origin: Supraspinous fossa Insertion: greater tubercle of the humerus Function: abduction of the humerus. Details vary from one study to another but it appears to pull the humerus into the fossa as it abducts and resists downward glide of the …
