Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Posterior Axioappendicular Muscles of the Shoulder
Document related concepts
Transcript
This document was created by Alex Yartsev ([email protected]); if I have used your data or images and forgot to reference you, please email me. Posterior Axioappendicular Muscles of the Shoulder: the Intrinsic Group with Rotator Cuff muscles These are the deltoid and teres major; and the 4 rotator cuff muscles (teres minor, supraspinatus, infraspinatus and subscapularis) Deltoid Posterior Axioappendicular Intrinsic muscles Again, supplied by totally different nerves. Deltoid axillary nerve - Supraspinatus - Originates from the lateral third of the clavicle, the acromion, and the lateral spine of scapula. Inserts into the deltoid tuberosity of humerus THREE PARTS: Anterior part flexes and medially rotates the humerus o Middle part abducts the humerus o Posterior part extends and laterally rotates the arm o The middle part is multipennate; the others are unipennate It cannot initiate abduction on its own when the arm is fully adducted- thus it needs supraspinatus to initiate the movement. It becomes effective after about 15 degrees of abduction. The deltoid’s anterior and posterior parts swing your arms while walking.it also helps to keep the humeral head in the glenoid fossa. o Infraspinatus Subscapularis Teres Major Teres Minor Iinsertion of deltoid, at the Deltoid Tuberosity - Teres major lower subscapular nerve Deltoid Supraspinatus Deltoid - Originates from the posterior surface of the inferior angle of scapula Inserts into the medial lip of the intertubercular groove of humerus Adducts and medially rotates the arm Also keeps the head of humerus in the socket Rotator Cuff Muscles Whatever other actions they may have, they all help hold the humeral head in the glenoid fossa Supraspinatus suprascapular nerve Infraspinatus - Subscapularis Teres Major Innervation Upper Subscapular nerve Axillary nerve: Off the posterior cord Lower Subscapular nerve Teres Minor Deltoid Subscapularis Subscapularis Teres major Teres Minor Teres Major - Suprascapular nerve Supraspinatus Infraspinatus Originates in the supraspinous fossa of the scapula Inserts into the superior facet of the greater tubercle of humerus Initiates abduction, and assists the deltoid with abduction of the arm; its the only one that doesn't rotate the arm. Infraspinatus suprascapular nerve - Originates in the infraspinous fossa of the scapula Inserts into the middle facet of the greater tubercle of humerus Laterally rotates the arm Teres Minor axillary nerve - Originates from the middle of the lateral border of scapula Inserts into the inferior facet of the greater tubercle of humerus Laterally rotates the arm Subscapularis upper and lower subscapular nerves - . Originates in the subscapular fossa Inserts into the lesser tubercle of humerus Medially rotates and abducts the arm
