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Citation, DOI and article data. Smith, L. Reference article, Radiopaedia. URL of Article. On this page:. Quiz questions. Normal and Pathological Anatomy of the Shoulder. Read it at Google Books - Find it at Amazon 2. Brookes M, Revell WJ. Blood Supply of Bone: Scientific Aspects. It is only about 1 inch 2. The anterior end of the acromion is flat and smooth to form the acromioclavicular joint with the clavicle. The acromioclavicular joint, or AC joint, is an important part of the shoulder that forms a joint between the acromion and the clavicle.
It is a planar synovial joint that holds the scapula and clavicle together while allowing the scapula to glide in many directions relative to the rest of the body. Two major muscles, the deltoid and trapezius, attach to the acromion. The deltoid, which abducts the arm at the shoulder, forms its origin along the acromion, the spine of the scapula, and the clavicle. From these origins, it crosses the shoulder joint and inserts on the deltoid tuberosity of the humerus. The trapezius muscle arises from the spinous processes of the cervical and thoracic vertebrae and inserts on the acromion and spine of the scapula.
Contraction of the trapezius rotates and retracts the scapula or may help to stabilize its position. By: Tim Taylor. Last Updated: Oct 27, Anatomy The pectoral girdle is an important region of the skeletal system that attaches the upper limb to the axial skeleton.
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