| caput costae | The rounded medial extremity of a rib which, except for ribs 1, 10, 11, and 12, articulates by two facets with the bodies of two contiguous vertebrae. Synonym: caput costae. (05 Mar 2000) |
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| collum costae | The flattened portion of a rib between the head and the tuberosity. Synonym: collum costae. (05 Mar 2000) |
| corpus costae | The shaft of a rib; the portion which extends laterally, anteriorly, and then medially from the tubercle. Synonym: corpus costae. (05 Mar 2000) |
| costae fluctuantes | The two lower ribs on either side that are not attached anteriorly. Synonym: costae fluitantes, costae fluctuantes, vertebral ribs. (05 Mar 2000) |
| costae fluitantes | The two lower ribs on either side that are not attached anteriorly. Synonym: costae fluitantes, costae fluctuantes, vertebral ribs. (05 Mar 2000) |
| costae spuriae | <anatomy> Five lower ribs on either side that do not articulate with the sternum directly. Synonym: costae spuriae, vertebrochondral ribs. (05 Mar 2000) |
| costae verae | Seven upper ribs on either side whose cartilages articulate directly with the sternum. Synonym: costae verae, vertebrosternal ribs. (05 Mar 2000) |
| crista capitis costae | The ridge that separates the superior and inferior articular surfaces of the head of a rib. Synonym: crista capitis costae. (05 Mar 2000) |
| crista colli costae | The sharp upper margin of the neck of a rib. Synonym: crista colli costae. (05 Mar 2000) |
| sulcus costae | A groove in the lower inner border of the rib, lodging the intercostal vessels and nerve. Synonym: sulcus costae, subcostal groove. (05 Mar 2000) |
| sulcus costae arteriae subclaviae | <anatomy, artery> A groove immediately posterior to the scalene tubercle on the upper surface of the first rib across which the subclavian artery passes. Synonym: sulcus costae arteriae subclaviae. (05 Mar 2000) |
| tuberculum costae | The knob on the posterior surface of a rib, at the junction of its neck and shaft, which articulates with the transverse process of the vertebra, whch corresponds in number to the rib, forming a costotransverse joint. Synonym: tuberculum costae. (05 Mar 2000) |
| facies articularis capitis costae | An articular surface on the head of a rib that articulates with the body of a vertebra. Synonym: facies articularis capitis costae. (05 Mar 2000) |
| facies articularis tuberculi costae | An oval facet on the inferomedial part of the tubercle of a rib for articulation with a facet on the transverse process of a vertebra. Synonym: facies articularis tuberculi costae. (05 Mar 2000) |
| ligamentum capitis costae intra-articulare | Transverse fibres extending within the capsule from the ridge between the two facets on the head of the rib to the intervertebral disk. Synonym: ligamentum capitis costae intra-articulare. (05 Mar 2000) |