What Is The Wrist?

The part of the body that most people think of as their wrist is actually the distal end of their radius and ulna bones, or, in other words the end of their arm bones.

The wrist itself, however, also called the carpus from the latin, is actually made up of eight small bones called carpal bones.

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Acromioclavicular Joint (AC Joint) Overview and Injuries

The abbreviation AC or AC joint stands for the acromioclavicular joint. The acromioclavicular is one of the three articulations of the shoulder girdle. See the shoulder complex for a general overview of the shoulder girdle and its joints.

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Synarthrodial Joints (Synarthroses, Fibrous)

Syndarthrodial Joints: Also called synarthroses or fibrous joints. Generally immovable joints that are found between bones that come into very close contact with each other and lack a synovial cavity. These bones are fastened tightly together by a fibrous connective tissue. See also diarthrodial jonits and amphiarthrodial joints.

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Condyoid Joint

Condyloid Joint: Also called an ellipsoidal joint, ovoid, or condylar joint, a bi-axial diarthrodial or synovial joint were one oval-shaped articulating surface (a condyle), fits into a corresponding ovoid depression in the other articulating surface. Movement is possible in two planes and includes flexion, extension, abduction, adduction and circumduction, but not rotation. See the diarthrodial article for examples and other types of joints.

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Condyle: (kòn´ dil) A term applied to bones, condyle comes from the Greek kondylos, meaning "a knuckle." It is a rounded process on a bone that usually serves to articulate with another bone.1

The adjective form is condylar. Some examples of condyles are given below.

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Biaxial Joint

Biaxial Joints: Joints such as the ankle and wrist. They allow movement about two perpendicular axes, which are axes at right angles to each other. This movement is usually abduction/adduction about the anteroposterior axes or flexion/extension about the mediolateral axes.

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Radial Deviation

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Cartilaginous Joint

Cartilaginous Joints: Also known as amphiarthrodial joints. These joints are united by a continuous pad of hyaline cartilage and only allow limited movement.

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Arthrology: A branch of anatomy and medicine which studies joints, articulations, and joint diseases. Arthrology is concerned with the classification of joints in terms of their structure and their movement.

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Diarthrosis Joints (Diarthrodial or Synovial)

Diarthrosis, Diarthrodial, or Synovial Joints: Diarthrosis is a joint classification used when considering joint function (degree of movement). These are joints which are freely moveable, meaning they allow a great deal of movement, such as the elbows, knees, and shoulders. In contrast, joints which allow only a slight degree of movement are called amphiarthrodial and those which allow no movement are called synarthrodial.

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Amphiarthrodial Joints

Amphiarthrodial Joints: Also known as cartilaginous joints.

These are joints such as the intervertebral discs, sternebrae, sacro-iliac joints, pelvic symphyses, and mandibular symphyses.

Amphiarthrodial joints are only slightly movable with some being more movable than others, such as the intervertebral discs or symphysis pubis where the two pubic bones come together.

See also diarthrodial joints.

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Arthrodial Joint

Arthrodial Joint = A type of synovial (or diarthrodial) joint in which bones glide on each other with limited movement such as the carpal bones of the wrist or tarsal bones of the foot. Also called a gliding, plane, or irregular joint.

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The Shoulder Complex: Demystifying the Shoulder with Eric Beard

The shoulder joint itself is known as the glenohumeral joint. It is a multi-axial ball and socket enarthrodial joint. This joint is the articulation between the glenoid fossa of the scapula and the head of the humerus. This is the area that most people think of as the shoulder joint. The humerus is, however, one bone of the shoulder.

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