What are the 3 joints in the shoulder?
Joints of the Shoulder Four major shoulder joints help to achieve a complex range of motion: the glenohumeral joint, the acromioclavicular joint, the scapulothoracic joint, and the sternoclavicular joint.
What type of synovial joint is the shoulder?
ball-and-socket type
A. Shoulder Joint: The shoulder joint is a ball-and-socket type synovial joint (Figure 1). The very shallow glenoid cavity of the scapula and the large humeral head endow the shoulder joint with the greatest degree of mobility of any joint in the body.
Is the shoulder a ball and socket joint?
The glenohumeral joint, also known as the shoulder joint, is a ball-and-socket joint that connects the upper arm to the shoulder blade. This joint allows free movement of the arm so that it can rotate in a circular fashion.
What are synovial joints?
A synovial joint, also known as a diarthrosis, is the most common and most movable type of joint in a mammal’s body. Diarthroses are freely movable articulations. In these joints, the contiguous bony surfaces are covered with articular cartilage and connected by ligaments lined by synovial membrane.
What are the 4 shoulder joints?
Four joints are present in the shoulder: the sternoclavicular (SC), acromioclavicular (AC), and scapulothoracic joints, and glenohumeral joint.
How many synovial joints are there?
The six types of synovial joints are pivot, hinge, condyloid, saddle, plane, and ball-and socket-joints (Figure 9.4.
Which are the synovial joints?
Synovial joints are often further classified by the type of movements they permit. There are six such classifications: hinge (elbow), saddle (carpometacarpal joint), planar (acromioclavicular joint), pivot (atlantoaxial joint), condyloid (metacarpophalangeal joint), and ball and socket (hip joint).
Which joint is in shoulder?
The glenohumeral joint is the one most people think of as the shoulder joint. It is formed where a ball (head) at the top of the humerus fits into a shallow cuplike socket (glenoid) in the scapula, allowing a wide range of movement.
Do shoulder joints have synovial fluid?
In a healthy shoulder, the synovium secretes a gel-like substance called synovial fluid that lubricates the joint and helps absorb stress during movement. Pain and stiffness related to osteoarthritis have been linked to a thinning of synovial fluid, which further contributes to joint degeneration.
What are the different types of synovial joints?
Synovial joints are subdivided based on the shapes of the articulating surfaces of the bones that form each joint. The six types of synovial joints are pivot, hinge, condyloid, saddle, plane, and ball-and socket-joints (Figure 3). Figure 3. Types of Synovial Joints.
What kind of movement is allowed in the shoulder joint?
Movements As a ball and socket synovial joint, there is a wide range of movement permitted: Extension (upper limb backwards in sagittal plane) – posterior deltoid, latissimus dorsi and teres major. Flexion (upper limb forwards in sagittal plane) – pectoralis major, anterior deltoid and coracobrachialis.
Which is the articulating bone in the shoulder joint?
Articulating bones are humerus and scapula (the clavicle is not part of the shoulder joint). Allows a great range of movement in all directions. Many muscles are used to move the shoulder joint, including the deltoid, trapezius and latissimus dorsi.
What causes swelling and stiffness in the shoulder area?
Bursitis is the inflammation of a bursa near a joint. This will cause pain, swelling, or tenderness of the bursa and surrounding area, and may also result in joint stiffness. Bursitis is most commonly associated with the bursae found at or near the shoulder, hip, knee, or elbow joints.