The head of typical rib articulates with the body of numerically corresponding vertebra and also with the body of next higher vertebra.
Synovial type of plane joint.
- Capsular ligament (joint capsule): It’s the fibrous capsule that covers/encloses the joint and is connected to the articular margins.
- Radiate ligament/triradiate ligament: It stretches from the anterior aspect of the head of rib and breaks up into 3 bands: upper, lower, and middle. The upper and lower bands are connected to the sides of upper and lower vertebrae. The middle band (also referred to as intra-articular ligament) gets connected to the intervertebral disc.
- Intra-articular ligament: It stretches from the crest between the 2 articular facets on the head of rib to the intervertebral disc and splits the joint cavity into 2 parts.
- The 1st, 10th, 11th, and 12th ribs joint with the bodies of numerically corresponding vertebrae.
- Costovertebral joint of typical ribs got 2 joint cavities and those of atypical ribs have single joint cavity.