| primitive groove | The median depression in the primitive streak flanked by the primitive ridges. Synonym: primitive furrow. (05 Mar 2000) |
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| sagittal groove | The groove in the midline of the inner table of the calvaria lodging the superior sagittal sinus. Synonym: sulcus sinus sagittalis superioris, sagittal groove, sagittal sulcus, superior longitudinal sulcus. (05 Mar 2000) |
| pterygopalatine groove | A groove on both the body of the maxilla and the perpendicular plate of the palatine bone; when the bones are articulated the grooves form the greater palatine canal. Synonym: sulcus palatinus major, pterygopalatine groove, sulcus for greater palatine nerve, sulcus pterygopalatinus. (05 Mar 2000) |
| Sibson's groove | A groove occasionally seen on the outer side of the thorax formed by the prominent lower border of the pectoralis major muscle. (05 Mar 2000) |
| sigmoid groove | A broad groove in the posterior cranial fossa, first situated on the lateral portion of the occipital bone, then curving around the jugular process on to the mastoid portion of the temporal bone, and finally turning sharply on the posterior inferior angle of the parietal bone and becoming continuous with the transverse groove; it lodges the transverse sinus. Synonym: sulcus sinus sigmoidei, sigmoid fossa, sigmoid groove, sigmoid sulcus. (05 Mar 2000) |
| spiral groove | <anatomy, nerve> The shallow groove that passes around the shaft of the humerus; it lodges the radial nerve and deep brachial artery. Synonym: sulcus nervi radialis, musculospiral groove, spiral groove. (05 Mar 2000) |
| nasolabial groove | A furrow between the wing of the nose and the lip. Synonym: sulcus nasolabialis. (05 Mar 2000) |
| nasopalatine groove | A groove on the vomer lodging the nasopalatine nerve. (05 Mar 2000) |
| nasopharyngeal groove | An indistinct line marking the boundary between the nasal cavities and the nasal part of the pharynx. (05 Mar 2000) |
| neural groove | The gutter-like groove formed in the midline of the embryo's dorsal surface by the progressive elevation of the lateral margins of the neural plate; the ultimate dorsal fusion of the margins results in the formation of the neural tube. Synonym: medullary groove. (05 Mar 2000) |
| subclavian groove | A groove on the inferior surface of the body of the clavicle to which is attached the subclavius muscle. Synonym: sulcus musculi subclavii, subclavian sulcus, sulcus subclavianus. (05 Mar 2000) |
| subcostal groove | A groove in the lower inner border of the rib, lodging the intercostal vessels and nerve. Synonym: sulcus costae, subcostal groove. (05 Mar 2000) |
| supplemental groove | A curvilinear depression normally found on each side of a triangular ridge (crista triangularis). (05 Mar 2000) |
| supra-acetabular groove | A groove, posterosuperior to the acetabulum, that is the attachment for the reflected head of the rectus femoris muscle. Synonym: sulcus supra-acetabularis, supra-acetabular sulcus. (05 Mar 2000) |
| dental groove | A transitory depression in the gingival surface of the embryonic jaw along the line of ingrowth of the dental lamina. (05 Mar 2000) |