# Anatomy of the Shoulder Joint

https://www.youtube.com/watch?v=66wzJ4W_r54

[00:24] Okay, ma'am. Done with the question.
[00:26] Okay, ma'am. Done with the question.
[00:26] Okay, so if you've already read and understood considering it's surgical and not menstruation, please tell me which region are you able to identify?
[00:40] which region are you able to identify? Mhm.
[00:42] If you could identify this
[00:45] Yes. Yes, ma'am.
[00:47] Ma'am this is pectoralis major muscle.
[00:52] And that is a deltoid deltoid muscle.
[00:54] Which one >> Which one is deltoid?
[00:58] Ma'am, I cannot This one is deltoid, ma'am. Yes. Okay,
[01:03] and out of here in the chest it's 11, 12, and 10.
[01:06] Which one is pectoralis major muscle you are telling me about?
[01:13] Sorry, ma'am. I cannot see the video. I cannot see the
[01:17] Yes. I can I feel like Yes, ma'am. Sorry, can you please repeat the question?
[01:20] Yes, I wanted you to
[01:24] The question? Yes, I wanted you to identify which exactly is the pectoralis major muscle you're talking about.
[01:34] Anterior fibers. No, no. Please, have a look.
[01:41] 11, 12, and 10. Which one? Sorry, ma'am. I I'm talking about the 12 and
[01:47] Yes, ma'am.
[01:49] All right. Please, if you could what more could you see?
[01:58] Tell me how? Okay, this is the pectoral region. All right, fine. And this is the deltoid muscle.
[02:05] Please tell me the origin and insertion of the deltoid muscle.
[02:10] Ma'am, deltoid originates from two heads, sternal head and the clavicle
[02:17] Um clavicle from the clavicle and then scapula.
[02:25] And it inserts into the deltoid.
[02:27] And it inserts into the deltoid tuberosity of the humerus.
[02:32] Okay, what is the function of the deltoid muscle and what is the nerve supply of deltoid muscle?
[02:41] deltoid muscle? Nerve supply is axillary nerve, ma'am.
[02:44] Nerve supply is axillary nerve, ma'am. Deltoid helps in abduction of the arm more than around more than 15°.
[02:51] Okay.
[02:52] Okay.
[02:55] Right. Please tell me which All right, okay.
[02:57] What is the nerve supply of this region?
[02:58] Pectoral region.
[03:03] Um Medial pectoral nerve and lateral pectoral nerve, ma'am.
[03:06] Okay, please tell me how the shoulder joint is formed.
[03:12] Shoulder joint is formed by glenoid labrum and by the head of humerus.
[03:20] Is that okay?
[03:21] Okay.
[03:23] Uh
[03:25] What are the structures which stabilizes the shoulder joint?
[03:31] Ma'am, there are static restraints and dynamic restraints.
[03:33] In static, glenoid glenoid cavity, negative intra-articular pressure, and ligaments.
[03:43] And in a dynamic, there is a rotatory cuff muscles.
[03:48] Because of the contraction of these muscles, the shoulder joint will be stabilized.
[03:55] What is shoulder shoulder shoulder girdle?
[04:07] Ma'am, sorry. I don't know. Shoulder girdle.
[04:09] Okay, right. What are the movements which are present at shoulder joint?
[04:18] There is a flexion, extension, internal rotation, external rotation, abduction, and adduction.
[04:26] abduction, and adduction.
[04:26] And rotation.
[04:28] And rotation.
[04:28] Okay, right.
[04:30] Okay, right.
[04:30] Please tell me Okay, you've told me the
[04:32] Please tell me Okay, you've told me the movements and um
[04:37] Okay, what type of joint is the shoulder
[04:39] Okay, what type of joint is the shoulder joint?
[04:41] joint?
[04:41] It is a synovial joint, ma'am.
[04:43] In that, it is a ball and socket joint.
[04:46] Good.
[04:46] Okay.
[04:47] Okay.
[04:47] Right.
[04:49] Yes.
[04:49] Right.
[04:49] You told me kind of Okay, what do
[04:52] Right. You told me kind of Okay, what do you understand by the by the term
[04:54] you understand by the by the term rotator cuff muscles?
[04:58] rotator cuff muscles?
[04:58] Ma'am, rotatory cuff muscles, there are
[05:00] four which are situated around the
[05:04] head which are situated near and around
[05:07] the head of humerus.
[05:07] So, there are
[05:10] subscapularis, supraspinatus,
[05:12] infraspinatus, and teres minor.
[05:15] Okay.
[05:17] What are the structures which are
[05:19] attached to the coracoid process?
[05:23] There is a pectoralis minor, insertion
[05:27] There is a pectoralis minor, insertion of pectoralis minor, origin of of pectoralis minor, origin of coracobrachialis, and coracobrachialis, and short head of biceps.
[05:34] short head of biceps.
[05:34] Okay, and the ligaments?
[05:37] Ligaments, coracoclavicular, coracohumeral, and coracoacromial ligaments.
[05:43] Good. All right. At what point shoulder joint is weakest?
[05:50] At the inferior Yes.
[05:52] In the inferior region, ma'am, because of lack of ligaments and quadrangular space is present, so So, all right.
[06:01] Now that you're talking about quadrangular space, okay, we'll come back to this picture later.
[06:09] Please identify in which picture picture A or picture B is the quadrangular space?
[06:17] B, ma'am.
[06:18] Yes, good. What are the boundaries of quadrangular space?
[06:24] Superiorly by teres minor, inferiorly by teres major, medially by long head of
[06:31] teres major, medially by long head of triceps, laterally by triceps, laterally by humerus bone.
[06:33] triceps, laterally by humerus bone.
[06:35] Good. What are the humerus bone.
[06:35] Good. What are the contents of the quadrangular space?
[06:39] contents of the quadrangular space?
[06:42] Axillary nerve and posterior circumflex artery.
[06:44] artery. Good. Please identify the space depicted in picture A.
[06:48] Good. Please identify the space depicted in picture A.
[06:53] What is this space called?
[06:57] What is this space called?
[06:58] Um Triangular space.
[06:59] Triangular space.
[07:01] Please tell me identify the boundaries.
[07:04] It is bounded superiorly by teres minor and inferiorly by teres major and uh uh and the laterally by um long head of triceps.
[07:08] It is bounded superiorly by teres minor and inferiorly by teres major and uh uh and the laterally by um long head of triceps.
[07:11] minor and inferiorly by teres major and uh uh and the laterally by um long head of triceps.
[07:12] uh uh and the laterally by um long head of triceps.
[07:14] and the laterally by um long head of triceps.
[07:16] and the laterally by um long head of triceps.
[07:18] um long head of triceps.
[07:20] long head of triceps. >> Long head of triceps. Yes, it's from the back. Okay, please tell me the Yes, the contents.
[07:22] Yes, it's from the back. Okay, please tell me the Yes, the contents.
[07:25] back. Okay, please tell me the Yes, the contents.
[07:27] contents. Of triangular circumflex capsular artery.
[07:28] Of triangular circumflex capsular artery.
[07:30] triangular circumflex capsular artery. Okay, just artery? Vessels? Both?
[07:34] Okay, just artery? Vessels? Both? Yes, vessels, ma'am. Yes, all right.
[07:36] Yes, vessels, ma'am. Yes, all right. Please tell me what are the muscles which are inserted in bicipital groove?
[07:43] Latissimus
[07:45] Latissimus dorsi,
[07:47] dorsi, teres major, teres major, and teres major, teres major, and pectoralis major. Pectoralis major.
[07:55] pectoralis major. Pectoralis major. Okay, please tell me um
[08:02] You got disconnected.
[08:05] You got disconnected. No. Okay.
[08:07] No. Okay. Yes, we'll come back to that previous image.
[08:12] Can you identify this image eight? This object eight in this picture?
[08:20] This is a cephalic vein, ma'am. Cephalic vein. How is it formed, please?
[08:26] It is formed from the
[08:29] It is formed from the venous arch from the dorsum of the hand and it
[08:35] arch from the dorsum of the hand and it travels laterally and
[08:42] It It It travels laterally in the arm and
[08:45] It travels laterally in the arm and forearm.
[08:47] forearm.
[08:49] And it joins and it
[08:53] Okay, we can come back to that later.
[08:55] Okay, we can come back to that later. Okay. Right.
[09:00] What I want you to tell me more is
[09:05] What I want you to tell me more is What are the reflexes?
[09:08] What are the reflexes?
[09:12] Okay, that we can do that later.
[09:15] But would you be able to identify serratus anterior here
[09:17] serratus anterior here in this picture or the previous one?
[09:23] Um
[09:25] Um Ma'am, in this I cannot identify because
[09:27] Ma'am, in this I cannot identify because it is uh
[09:30] it is uh Okay, it's above because that
[09:33] Okay, it's above because that origins from Okay, from ribs um
[09:37] origins from Okay, from ribs um one to eight, so it could be Yes, it's one to eight, so it could be Yes, it's it's from here.
[09:42] from here.
[09:44] All right. Um please tell me looking at this picture, here it is sternum and if you could identify and tell me how this sternum articulates with the acromion process of the or just with the acromion.
[10:02] a joint, ma'am, sternoacromial Yes.
[10:06] Sorry, ma'am. Sternum and acromion. Yes, acromion.
[10:12] With the help of clavicle, it will be attached, ma'am.
[10:18] Yes, but there is no attachment direct.
[10:22] Good. Right.
[10:24] What I want you to Okay, what is the most important function of pectoralis major muscle?
[10:34] It helps in adduction and
[10:38] Adduction and flexion, ma'am.
[10:39] Flexion, ma'am.
[10:41] Respiratory muscle. And also the accessory respiratory muscle.
[10:43] Accessory respiratory muscle.
[10:44] Yes.
[10:48] What are the conditions in which MRI of the shoulder is asked for?
[10:51] The shoulder is asked for?
[10:54] When there is any suspicious of labrum tear or any impingement syndrome or any trauma to the shoulder.
[11:00] Any suspicious of labrum tear or any impingement syndrome.
[11:03] Impingement syndrome or any trauma to the shoulder.
[11:06] Or any trauma to the shoulder.
[11:06] Okay, what is impingement syndrome?
[11:12] When the rotatory in a particular degree of the rotation of the arm, the patient will complain of pain.
[11:15] When the rotatory in a particular degree of the rotation.
[11:18] In a particular degree of the rotation of the arm, the patient will complain of pain.
[11:20] Of the arm, the patient will complain of pain.
[11:23] And what happening?
[11:27] And what happening?
[11:28] What happens to the patient?
[11:30] Subscapularis muscle is involved in that, ma'am.
[11:32] Muscle is involved, but what exactly is happening?
[11:35] What happens with the labrum?
[11:38] What happens with the labrum?
[11:38] Okay, doesn't matter.
[11:41] Okay, doesn't matter.
[11:44] Okay, I think I have asked you most of the questions with regard to shoulder joint, but uh.
[11:54] All right, thank you.
[11:57] All right, thank you.
[11:57] Thank you, ma'am.