Latest news from Madison Heights, MI collected exclusively by city-data.com from local newspapers, TV, and radio stations. Ancestries: German (14.3%), Polish (9.5%), Irish (9.3%), English (7.6%), United States (5.6%), Italian (5.5%). Current Local Time: EST time zone. Land area: 7.16 square miles.
exists and is an alternate of . Doctor of Internal Medicine Psychiatry and Neurology (Board Cert.) Geriatric Medicine (Board Cert.) Addiction Medicine (Board Cert.) No. The shoulder and arm is part of the appendicular skeleton, whereas the trunk is formed around the axial skeleton.
The shoulder is a ball and socket joint (Figure 2). The ball is the upper part of the arm bone (humerus) and is called the humeral head. The socket is smaller and is part of the shoulder blade (scaptila). The ball is held in the socket by ligaments and by the rotator cuff tendons. The rotator cuff muscles start on the shoulder blade and turn into tendons which attach to the ball. In shoulder replacement surgery the ball is replaced with a metal ball attached to a stem (Figure 3). The stem is inserted down the shaft of the humerus.