Types of Shoulder
The shoulder is a complex joint that consists of several bones, muscles, tendons, and ligaments. It is one of the most mobile joints in the body, and it allows for a wide range of motion. There are four types of shoulder: the ball and socket joint, the glenohumeral joint, the acromioclavicular joint, and the scapulothoracic joint.
Ball and Socket Joint
The ball and socket joint is the most common type of shoulder joint. This type of joint allows for a wide range of motion, including abduction, adduction, flexion, extension, and internal and external rotation. It is made up of the head of the humerus, which is the large bone in the upper arm, and the glenoid cavity, which is a cup-like structure in the shoulder blade.
Glenohumeral Joint
The glenohumeral joint is a type of synovial joint. This type of joint allows for a wide range of motion, including abduction, adduction, flexion, extension, and internal and external rotation. It is made up of the head of the humerus and the glenoid cavity.
Acromioclavicular Joint
The acromioclavicular joint is a type of diarthrodial joint. This type of joint allows for a limited range of motion, including abduction, adduction, and internal and external rotation. It is made up of the acromion, which is a bony projection on the shoulder blade, and the clavicle, which is the collarbone.
Scapulothoracic Joint
The scapulothoracic joint is a type of synovial joint. This type of joint allows for a limited range of motion, including abduction, adduction, and internal and external rotation. It is made up of the scapula, which is the shoulder blade, and the thoracic wall, which is the rib cage.