The shoulder is one of the body's largest and most complicated joints. Like a ball and socket, the humerus (upper arm bone) inserts into the scapula (shoulder blade) to form the shoulder joint. The following bones are crucial in the shoulder: The scapula's acromion is a bony protrusion. In the acromioclavicular joint, the clavicle (collarbone) joins the acromion. The coracoid process is a bony projection from the scapula that looks like a hook.
The elbow is one of the body's largest joints. The elbow, together with the shoulder joint and wrist, is responsible for most of the arm's mobility, as well as its structure and durability. The elbow extends the forearm by swinging 180 degrees in one direction, and it also aids in turning the forearm at the place where the forearm's parallel bones, the radius and ulna, meet. Ligaments connect the bones and hold them together. Ligaments are connective tissue that is tough and flexible. Ligaments can also connect bones and cartilages, in addition to holding joints together.