Shoulder
Shoulder
Shoulder (/ˈʃoʊldər/) is a complex joint that connects the arm to the torso. It is one of the most mobile joints in the human body and allows the arm to move in multiple directions.
Etymology
The term "shoulder" comes from the Old English word "sculdor," which means "shoulder."
Anatomy
The shoulder joint is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone). These bones are held together by a network of muscles, ligaments, and tendons.
The shoulder joint is a type of ball and socket joint, which allows for a wide range of motion. The ball of the joint is the head of the humerus, and the socket is the glenoid, a part of the scapula.
Related Terms
- Rotator cuff: A group of muscles and tendons that surround the shoulder joint, providing stability and allowing for various movements of the shoulder.
- Glenohumeral joint: The main joint of the shoulder, formed by the articulation of the humerus and the glenoid of the scapula.
- Acromioclavicular joint: A joint at the top of the shoulder, where the acromion process of the scapula and the clavicle meet.
- Subacromial bursa: A fluid-filled sac located under the acromion process of the scapula, which helps to reduce friction between the rotator cuff and the acromion.
- Frozen shoulder: A condition characterized by stiffness and pain in the shoulder joint.
External links
- Medical encyclopedia article on Shoulder
- Wikipedia's article - Shoulder
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