 Good day everybody. I'm Dr. Sanjay Sanyal, Prof. in Department Chair. Welcome to a dissection of the rotator cuff muscles in the syndrome. Just to bring you up to speed, this was an earlier dissection. This was a trapezius muscle. This is the latsomus dorsi and we have cut it open and these are the structures which are under the trapezius muscle which we have already described. What I have done now is I have cleaned up the face here to show a few other structures. Let's take a quick look. This is the triangle of auscultation that we have been mentioning now. It's much more clearly visible. The triangle of auscultation provides a muscle free area for auscultation of the posterior lobe of the lung. And it is bounded by the superior border of the latsomus dorsi, the lateral border of the trapezius and the medial border of the scapula partly covered by the rhomboids major. So this is the so-called triangle of auscultation. This is the spine of the scapula. So above the spinal scapula, this is the supraspinatus fossa and you can see a muscle here. This is the supraspinatus. This is one of the rotator cuff muscles. Perhaps the most important rotator cuff muscle. And the tendon where my finger is disappearing, the tendon of the supraspinatus goes like this and it gets inserted onto the greater tubercle of the humerus. Under the spinal scapula, this muscle that you see here is the infraspinatus. And arising from the medial border or the lateral border of the scapula, we have the teres minor and then we have the teres major. So supraspinatus, infraspinatus and teres minor, these three together and of course the subscapularis which is in front, we cannot see, they together constitute the rotator cuff muscles. And this is the teres major which we have seen. It gets inserted onto the medial lip of the intertubercular sulcus. And incidentally, before I proceed further, the teres major and the latsomus dorsi which has been split open here, these two together constitute the posterior wall of the axilla as well as the posterior fold of the axilla and you can see it clearly here. Additionally, we can see, I have exposed and dissected out the part of the deltoid muscle and you can see it's a powerful muscle. It's got multiple, multi-pinate fibers. These are the posterior fibers. They are arising from the spinal scapula and these are the central fibers arising from the acromion process. So posterior fibers are the one which move the hand backwards and they also act as gyrobes and the central fibers are the one which are responsible for abduction of the anterior fibers, of course, we cannot see. Let me now retract this to show you these structures here. This is part of the axillary nerve which runs on the deep surface and supplies the deltoid. And it is accompanied by the posterior circumflex humeral artery which we have already seen. So this is all for today's dissection. Thank you very much for watching. Ladies and gentlemen, Dr. Sanjay Sanyal signing out. Have a nice day. Don't forget to subscribe, click the like button and leave your comments in the comment section.