The costochondral joints are the joints between the ribs and costal cartilage in the front of the rib cage.
Each rib has a depression shaped like a cup that the costal cartilage articulates with.
Joints between costal cartilages of the sixth and ninth rib are plane synovial joints.
[1] The lateral end of each costal cartilage is received into a depression in the sternal end of the rib, and the two are held together by the periosteum.
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