Pivot joint: Difference between revisions

Latest revision as of 11:35, 15 February 2025

Pivot Joint[edit]

A pivot joint is a type of synovial joint in the human body that allows for rotational movement around a single axis. This type of joint is characterized by a cylindrical bone that rotates within a ring formed by a second bone and a ligament. Pivot joints are crucial for various movements and are found in specific locations in the body.

Structure[edit]

Pivot joints consist of a bony pivot surrounded by a ring of bone and ligament. The pivot is typically a rounded or pointed end of one bone that fits into a ring-like structure formed by another bone and a ligament. This configuration allows for rotational movement around the longitudinal axis of the pivot bone.

Function[edit]

The primary function of pivot joints is to allow for rotation. This type of movement is essential for various activities, such as turning the head from side to side or pronating and supinating the forearm. The rotational movement provided by pivot joints is crucial for the flexibility and range of motion in the areas where they are located.

Examples[edit]

There are two main examples of pivot joints in the human body:

Atlantoaxial joint: This joint is located between the first and second cervical vertebrae, known as the atlas and axis, respectively. It allows for the rotation of the head from side to side.

Proximal radioulnar joint: This joint is found in the forearm, where the head of the radius rotates within the radial notch of the ulna. It enables the pronation and supination of the forearm.

Related Pages[edit]

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-'''Pivot joint''' is a type of [[synovial joint]] that allows only rotational movement around a single axis. It is also known as a rotary joint. The pivot joint is exemplified by the joint between the [[atlas (anatomy)|atlas]] and the [[axis (anatomy)|axis]] (first and second cervical vertebrae), underneath the skull, allowing the head to turn from side to side.
+== Pivot Joint ==
+[[File:Gelenke_Zeichnung01.jpg|thumb|right|Diagram of a pivot joint]]
+A '''pivot joint''' is a type of [[synovial joint]] in the human body that allows for rotational movement around a single axis. This type of joint is characterized by a cylindrical bone that rotates within a ring formed by a second bone and a ligament. Pivot joints are crucial for various movements and are found in specific locations in the body.
 == Structure ==
-The pivot joint is a type of synovial joint. In these joints, the articulating bone ends are covered with [[articular cartilage]] and enclosed within an articular capsule that is lined by a [[synovial membrane]]. The synovial membrane produces [[synovial fluid]] that lubricates the joint and reduces friction and wear.
-In a pivot joint, one bone rotates about another. This is achieved where a rounded or pointed surface of one bone articulates with a ring formed partly by another bone and partly by a ligament.
+Pivot joints consist of a bony pivot surrounded by a ring of bone and ligament. The pivot is typically a rounded or pointed end of one bone that fits into a ring-like structure formed by another bone and a ligament. This configuration allows for rotational movement around the longitudinal axis of the pivot bone.
+== Function ==
+The primary function of pivot joints is to allow for rotation. This type of movement is essential for various activities, such as turning the head from side to side or pronating and supinating the forearm. The rotational movement provided by pivot joints is crucial for the flexibility and range of motion in the areas where they are located.
 == Examples ==
-The most obvious examples of pivot joints in the human body are the [[atlanto-axial joint]], between the atlas and the axis, and the [[proximal radioulnar articulation]], between the radius and the ulna in the forearm. These joints allow for rotation, such as turning the head from side to side or twisting the forearm.
-== Clinical significance ==
+There are two main examples of pivot joints in the human body:
-Injuries or diseases affecting the pivot joints can have significant impacts on mobility and quality of life. For example, [[rheumatoid arthritis]] is a chronic inflammatory disorder that can affect multiple joints, including the pivot joints. It can cause pain, swelling, and eventually result in joint deformity and erosion.
+* '''Atlantoaxial joint''': This joint is located between the first and second cervical vertebrae, known as the atlas and axis, respectively. It allows for the rotation of the head from side to side.
+* '''Proximal radioulnar joint''': This joint is found in the forearm, where the head of the radius rotates within the radial notch of the ulna. It enables the pronation and supination of the forearm.
+== Related Pages ==
-== See also ==
-* [[Joint]]
 * [[Synovial joint]]
-* [[Ball and socket joint]]
+* [[Atlantoaxial joint]]
-* [[Hinge joint]]
+* [[Proximal radioulnar joint]]
-* [[Saddle joint]]
+* [[Rotation (anatomy)]]
-* [[Condyloid joint]]
-* [[Plane joint]]
-[[Category:Joints]]
+[[Category:Anatomy]]
-[[Category:Human anatomy]]
+[[Category:Musculoskeletal system]]
-[[Category:Orthopedic surgical procedures]]
-{{stub}}