| primitive pit | The depression in the primitive node that serves to connect the notochordal canal with the surface ectoderm and the yolk sac. These connections are referred to as the neurenteric canal. (05 Mar 2000) |
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| pterygoid pit | A depression on the antero-medial side of the neck of the condylar process of the mandible, giving attachment to the lateral pterygoid muscle. Synonym: fovea pterygoidea, pterygoid depression, pterygoid pit. (05 Mar 2000) |
| sublingual pit | A shallow depression on either side of the mental spine, on the inner surface of the body of the mandible, superior to the mylohyoid line, lodging the sublingual gland. Synonym: fovea sublingualis, sublingual pit. (05 Mar 2000) |
| superior articular pit of atlas | One of two concave articular surfaces on the superior aspect of the lateral masses of the atlas that articulate with the occipital condyles. Synonym: facies articularis superior atlantis, fovea articularis superior atlantis, superior articular pit of atlas. (05 Mar 2000) |
| superior costal pit | A demifacet on the upper edge of the body of a vertebra articulating with the head of a rib; a single rib articulates with the inferior costal facet and superior costal facet of the adjacent vertebrae. Synonym: fovea costalis superior, superior costal pit. (05 Mar 2000) |
| suprameatal pit | A small depression on the mastoid part of the temporal bone, posterior to the suprameatal spine. Synonym: foveola suprameatica, mastoid fossa, fossa mastoidea, supramastoid fossa. (05 Mar 2000) |
| inferior articular pit of atlas | One of two concave surfaces on the lateral masses of the atlas that articulate with corresponding surfaces on the axis. Synonym: facies articularis inferior atlantis, fovea articularis inferior atlantis, inferior articular pit of atlas. (05 Mar 2000) |
| inferior costal pit | Demifacet on the lower edge of the body of a vertebra articulating with the head of a rib. Synonym: fovea costalis inferior, inferior costal pit. (05 Mar 2000) |
| oblong pit of arytenoid cartilage | A broad shallow depression on the anterolateral surface of the arytenoid cartilage, for attachment of the thyroarytenoid muscle. Synonym: fovea oblonga cartilaginis arytenoideae, oblong pit of arytenoid cartilage. (05 Mar 2000) |
| optic pit | A congenital structural defect of the optic nerve head. (05 Mar 2000) |
| ear pit | Tiny pit in front of the ear: preauricular pit. A minor anomaly of no great consequence in itself. More common in blacks than whites and in females than males. Can recur in families. The presence of 2 or more minor anomalies in a child increases the probability that the child has a major malformation. (12 Dec 1998) |
| triangular pit of arytenoid cartilage | A deep depression in the upper portion of the anterolateral surface of the arytenoid cartilage, lodging glands. Synonym: fovea triangularis cartilaginis arytenoideae, triangular pit of arytenoid cartilage. (05 Mar 2000) |
| trochlear pit | A shallow depression in the roof of the orbit close to the medial margin to which is attached the pulley for the superior oblique tendon. Synonym: fovea trochlearis, fossa trochlearis, trochlear fossa, trochlear pit. (05 Mar 2000) |