Included Major Bones • Scapula • glenoid fossa • infraspinatus fossa • supraspinatus fossa • scapular spine • coracoid process • acromion process • Clavicle • Humerus • greater tubercle • lesser tubercle • intertubercle groove • deltoid tuberosity • head
Bones Detailed:• Scapula is a flat, triangular bone that lies over the back of the upper ribs. The rear surface can be felt under the skin. It serves as an attachment for some of the muscles and tendons of the arm, neck, chest and back and aids in the movements of the arm and shoulder. It is well padded with muscle so that great force is required to fracture it. The back surface of each scapula is divided into unequal portions by a "spine." This spine leads to a "head," which bears two processes - the "acromion process" that forms the tip of the shoulder and a "coracoid process" that curves forward and down below the clavicle (collarbone). The acromion process joins a clavicle and provides attachments for muscles of the arm and chest muscles.• Humerus is the bone of the upper arm. The smooth, dome-shaped head of the bone lies at an angle to the shaft and fits into a shallow socket of the scapula (shoulder blade) to form the shoulder joint. Below the head, the bone narrows to form a cylindrical shaft. It flattens and widens at the lower end and, at its base, it joins with the bones of the lower arm (the ulna and radius) to make up the elbow.• Clavicle is the collarbone. There are two of these bones, that join the top of the sternum to the shoulder blade (scapula). The clavicles support the arms and transmit force from the arms into the central skeleton.• Acromion is a bony prominence at the top of the shoulder blade. On the head of the scapula, between the processes mentioned above, is a depression called the "glenoid cavity." It joins with the head of the upper arm bone (humerus).
Actual Joint• The two main bones are the scapula and humerus making the Glenohumeral ball and socket• Cushioned by articular cartilage (covering head of humerous and face of glenoid• Stabilized by a ring of fibrous cartilage around the glenoid called labrum
Related to Tennis• The shoulder joint is one of the most mobile joints in the human body.• During tennis, you perform multiple motions with your hitting arm, such as adduction, flexion and extension.• Adduction takes place when you swing your arm down across the front of your body, flexion takes place when you raise your arm straight up in front of your body and extension takes place when you move your arm backward for an underhand hit. These motions cause you to work many muscles in just one joint.
Muscles• Posterior View • Teres Minor • Teres Major • Infraspinatus • Supraspinatus • Tricep • Deltoid • Levator Scapula • Rhomboids Minor • Rhomboids Major • Trapezius • Latissimus Dorsi
Rotator Cuff SITS• Muscle make up: Supraspinatous, Infraspinatous, Teres minor, Subscapularis.• Stabilize shoulder, maintain proper movement, and keep intact of the glenohumeral joint• Without the rotator cuff, the humerus head would partially rise out of the glenoid fossa• Over use can be extremely sucepible to tear or other injury.