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The bones of the shoulder consist of the humerus(the upper arm bone), the scapula (the shoulder blade), and the clavicle (the collar bone). The clavicle is the only bony attachment between the trunk and the upper limb. It forms the front portion of the shoulder girdle and is
palpable along its entire length with a gentle S-shaped contour.The clavicle articulates at one end with the sternum (chest bone) and with the acromion of the scapula at the other. This articulation between the acromial end of the clavicle and the acromion of the scapula forms the roof of the shoulder. The scapula is a large, flat triangular bone with three processes called the acromion, spine and coracoid process . It forms the back portion of
the shoulder girdle. The spine (which is located at the back of the scapula) and the acromion can be readily palpated on a patient. The flat blade of the scapula glides along the back of the chest allowing for extended movement of the arm. The coracoid process is a thick curved structure that projects from the scapula and is the attachment point of ligaments and muscles. The scapula is also marked by a shallow, somewhat comma-shaped glenoid cavity , which articulates with the head of the humerus. The top end of the humerus consists of the head, the neck, the greater and lesser tubercles, and the shaft. The head is half-spherical in shape and projects into the glenoid
cavity. The neck lies between the head and the greater and lesser tubercles. The greater and lesser tubercles are prominent landmarks on the humerus and serve as attachment sites for the rotator cuff muscles.
There are four joints making up the 'shoulder joint':
Note how the ball ( head ) of the humerus fits into a shallow socket on the scapula called the glenoid . One can see that this ball does not fit into the glenoid cup at all; this allows for the wide range of movement provided by the shoulder, at the cost of skeletal stability. Joint stability is provided instead by the rotator cuff muscles , related bony processes and glenohumeral ligaments. What is the specific vertebra name of letter A?Atlas: The bone that articulates with the occipital condyles. 4. Thoracic vertebrae: These bones have articular facets for the ribs. 5.
Why is B considered a true rib?The first five ribs are termed true ribs because they attach directly to the sternum through the costal cartilage. The next five ribs are termed false ribs because they attach to the sternum indirectly through the costal cartilage.
What is the name of the upper portion of the sternum quizlet?manubrium sterni is the broad, upper part of the sternum.
What is the name of the superior portion of the sternum?The manubrium is the most superior portion of the sternum that articulates with the clavicle—forming the sternoclavicular (SC) joint.
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What portion of the sternum is identified by the letter A
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