![]() ![]() The spine continues laterally as the flat expanded acromion, which forms the subcutaneous point of the shoulder and articulates with the acromial end of the clavicle (acromioclavicular joint). ![]() ![]() The convex posterior surface of the scapula is unevenly divided by a thick projecting ridge of bone ( spine of the scapula) into a small supraspinous fossa and a much larger infraspinous fossa. The scapula, or shoulder blade, is a triangular flat bone that lies on the posterolateral aspect of the thorax, overlying the 2nd – 6th or 7th ribs. The conoid tubercle, onto which the conoid ligament attaches.The subclavian groove in the medial third of the shaft, which is a site of attachment of the subclavius muscle.The trapezoid line, which provides an attachment point for the trapezoid ligament.The surface markings of the clavicle include: Likewise, the shaft of the clavicle acts as an attachment site for several muscles, such as the trapezius, deltoid, pectoralis major, and sternocleidomastoid muscles. The acromial and sternal ends of the clavicle contain several bony landmarks that serve as attachment points for ligaments of their respective joints. The medial end of the clavicle articulates with the manubrium of sternum (sternoclavicular joint), while the acromial end articulates with the acromion of the scapula (acromioclavicular joint). The clavicle is composed of a sternal (proximal) end, a shaft (body) and a acromial (distal) end. In conjunction with the scapula, it serves as a connection between the axial and appendicular skeleton. The clavicle, or collarbone, is an S-shaped long bone lying superficial to the skin and is palpable along its entire length. Medial suprascapular nerve (sternoclavicular joint)Īxillary, suprascapular, lateral pectoral nerves (glenohumeral joint)įorms a connection between upper libms and thoracic cage įaciliates movements of the upper limb in the glenohumeral (shoulder) joint. Subscapular, lateral pectoral, axillary nerves (acromioclavicular joint) Internal thoracic and suprascapular arteries (sternoclavicular joint)Īnterior and posterior circumflex humeral arteries (glenohumeral joint) Suprascapular and thoracoacromial arteries (acromioclavicular joint) ![]() Scapulothoracic joint: Between the anterior surface of the scapula and the posterior thoracic cage. Glenohumeral joint: Between the head of the humerus and the glenoid fossa of the scapula Sternoclavicular joint: Between the manubrium of the sternum and the first costal cartilage with the sternal (proximal) end of the clavicle. Scapula and clavicle on each side, joined anteriorly by the manubrium of the sternumĪcromioclavicular joint: Between the acromion of the scapula and the acromial (distal) end of the clavicle. Incomplete bony ring that connects the upper limbs to the bones to the axial skeleton. Key facts about the shoulder girdle Definition This article will discuss the anatomy and functions of the shoulder girdle. Additionally, the shoulder girdle allows for a large range of motion, mainly in the highly mobile scapulothoracic joint. The shoulder girdle functions as the anchor that attaches the upper limbs to the axial skeleton. The scapulothoracic joint - formed between the scapula and the posterior thoracic cage.The glenohumeral (shoulder) joint - formed between the scapula and humerus.The acromioclavicular (AC) joint - formed between the scapula and the clavicle. The sternoclavicular joint - formed between the sternum and clavicle.The bones of the shoulder girdle articulate with each other and partake in the formation of 4 joints that include: The shoulder girdle, also called the pectoral girdle, is an incomplete bony ring formed by the clavicle and scapula on each side of the body, joined anteriorly by the manubrium of the sternum. ![]()
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