Youtor
๐๐ ๐๐ฅ๐๐จ๐ฐ ๐๐ง๐ ๐ซ๐๐๐ข๐จ๐ฎ๐ฅ๐ง๐๐ซ ๐ฃ๐จ๐ข๐ง๐ญ๐ฌ
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=Tkhm4x3YEMk
In this video we have discussed about shoulder joints and following related things to shoulder joint • Structure • Capsule • Muscles • Ligaments • Innervation • Blood supply • Function • Lets Get further to Shoulder Joint : • Scapula • The scapula is a triangular-shaped bone that functions mainly as a site for muscle attachment. Four rotator cuff muscles that act on the shoulder take their origin from the scapula. These are the supraspinatus, infraspinatus, teres minor, and subscapularis • Additionally, the trapezius, serratus anterior, rhomboids, and levator scapulae insert on the scapula and are responsible for scapular mobility and stability. The scapula is freely moveable, because it is suspended by these muscles. The scapula has 4 processes, the spine, the acromion, the coracoid, and the glenoid. The glenoid cavity (or, alternatively, the glenoid fossa) is set on the expanded aspect of the lateral angle of the scapula. The glenoid cavity is an irregularly shaped oval and has been compared to an inverted comma shape. It articulates with the head of the humerus, forming the glenohumeral joint, which serves as the main joint of the shoulder. • Clavicle • The clavicle is an S-shaped bone that forms the anterior portion of the shoulder girdle that keeps the arm away from the trunk, allowing it to move freely. The clavicle has 2 articulations, the sternoclavicular joint and the acromioclavicular joint. The sternoclavicular joint is formed by the medial aspect of the clavicle articulating with the manubrium of the sternum. This is the only skeletal connection between the axial skeleton and the upper extremity. Furthermore, the clavicle provides protection for the subclavian artery, subclavian vein, and brachial plexus posteriorly and inferiorly. • Humeral head • The proximal articular surface of the humerus is termed the humeral head. The humeral head articulates against the shallow glenoid cavity. Only 25% of the humeral head surface makes contact with the glenoid cavity. The glenoid labrum, a fibrocartilaginous ring attached to the outer rim of the glenoid cavity, provides additional depth and stability. • Articulations • Sternoclavicular joint • The sternoclavicular joint is the sole connection between the axial skeleton and the upper extremity. The sternoclavicular joint allows 30-35 º of upward elevation, 35 º of anteroposterior movement, and 44-50 º of rotation about the long axis of the clavicle. [8] • Acromioclavicular joint • The acromioclavicular (AC) joint is the only articulation between the clavicle and scapula. It is formed by the distal clavicle articulating with the acromion of the scapula. Little motion exists in this joint. The AC joint is an encapsulated diarthrodial joint held together by its joint capsule and the coracoclavicular ligaments: the trapezoid and conoid ligaments. • Glenohumeral joint • The glenohumeral joint is the main articulation of the shoulder joint. It is the multiaxial ball-and-socket synovial joint formed by the articular surfaces of the glenoid cavity and the head of the humerus. The glenoid cavity depth is increased by a rim of fibrocartilage that surrounds it. This rim of fibrocartilage is the glenoid labrum. • Labrum • The glenoid labrum is a ring composed of mostly dense fibrous tissue. The average depth of the glenoid cavity is 2.5 mm, but the labrum serves to increase this depth. Although the labrum increases the depth and volume of the glenoid cavity, it does not seem to increase the stability of the glenohumeral joint. [8] • Ligaments • Coracoclavicular • The conoid and trapezoid ligaments comprise the coracoclavicular ligaments (CCLs) (see the image below). They function to maintain the articulation of the clavicle with the coracoid process of the scapula. Studies have concluded that the coracoclavicular ligaments are the primary restraint to superior and posterior clavicular dislocation. • • we haven't discussed bursa which will be discussed later . • for more keep visiting / tixeschooling • Become Partner Of TixeSchooling : • Become Partner Of TixeSchooling
#############################
