Costal (from Latin costa - rib) - related to the ribs.
The ribs are the long, curved bones that make up the rib cage. A person usually has 12 pairs of ribs, 7 of which are called true, and the remaining 5 are called false.
The adjective "costal" is used to refer to the anatomical structures associated with the ribs. For example:
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Costal cartilages are cartilages that connect the ribs to the sternum.
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Rib muscles - muscles attached to the ribs and involved in the act of breathing.
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Costal nerves are nerves that innervate the intercostal muscles.
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Rib hump is a deformation of the chest due to abnormal development of the ribs.
Thus, the term “costal” indicates the connection of a particular anatomical formation with the ribs.