Articulation of head of rib
(Redirected from Articulatio capitis costae)
Articulation of Head of Rib
The articulation of the head of the rib is a joint in the human body that connects the head of a rib to the vertebral column. This articulation is crucial for the structural integrity and flexibility of the thoracic cage, allowing for the expansion and contraction necessary for respiration.
Anatomy
The head of each rib articulates with the bodies of two adjacent vertebrae and the intervertebral disc between them. This joint is classified as a synovial plane joint, which allows for slight gliding movements.
Structure
The head of the rib is wedge-shaped and has two articular facets separated by a crest. The superior facet articulates with the inferior costal facet of the vertebra above, while the inferior facet articulates with the superior costal facet of the corresponding vertebra.
The crest of the head of the rib is attached to the intervertebral disc by the intra-articular ligament, which divides the joint into two separate synovial cavities.
Ligaments
Several ligaments support the articulation of the head of the rib:
- Intra-articular ligament: Connects the crest of the head of the rib to the intervertebral disc.
- Radiate ligament: A strong band that radiates from the anterior aspect of the head of the rib to the bodies of the two adjacent vertebrae and the intervertebral disc.
Function
The articulation of the head of the rib allows for the movement necessary for breathing. During inspiration, the ribs elevate, increasing the volume of the thoracic cavity and allowing air to flow into the lungs. During expiration, the ribs depress, decreasing the thoracic volume and expelling air from the lungs.
Clinical Significance
Disorders of the rib articulations can lead to pain and restricted movement. Conditions such as costovertebral joint dysfunction can result from trauma, inflammation, or degenerative changes, affecting the normal function of the thoracic cage.
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Contributors: Prab R. Tumpati, MD
