| mylohyoid groove | A groove on the medial surface of the ramus of the mandible beginning at the lingula; it lodges the mylohyoid artery and nerve. Synonym: sulcus mylohyoideus, mylohyoid fossa. (05 Mar 2000) |
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| pontomedullary groove | The transverse groove on the ventral aspect of the brainstem that demarcates the pons from the medulla oblongata; from its bottom the sixth, seventh, and eighth cranial nerves emerge. (05 Mar 2000) |
| popliteal groove | A groove on the lateral condyle of the femur between the epicondyle and the articular margin. Its anterior end gives origin to the popliteus muscle; its posterior end lodges the tendon of the muscle when the knee is fully flexed. Synonym: sulcus popliteus. (05 Mar 2000) |
| posterior auricular groove | The sulcus between the antitragus and cauda helicis overlying the antitragicohelicine fissure. Synonym: sulcus auriculae posterior. (05 Mar 2000) |
| posterior intermediate groove | A longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym: sulcus intermedius posterior, posterior intermediate groove. (05 Mar 2000) |
| posterior interventricular groove | A groove on the diaphragmatic surface of the heart, marking the location of the septum between the two ventricles. Synonym: sulcus interventricularis posterior, crena cordis. (05 Mar 2000) |
| posterolateral groove | A longitudinal furrow on either side of the posterior median sulcus of the spinal cord marking the line of entrance of the posterior nerve roots. Synonym: sulcus lateralis posterior, posterolateral groove. (05 Mar 2000) |
| preauricular groove | A groove on the pelvic surface of the ilium just lateral to the auricular surface; it is more pronounced in the female. Synonym: paraglenoid groove, paraglenoid sulcus, preauricular sulcus, sulcus paraglenoidalis. (05 Mar 2000) |
| Harrison's groove | A deformity of the ribs which results from the pull of the diaphragm on ribs weakened by rickets or other softening of the bone. (05 Mar 2000) |
| primary labial groove | A furrow between the developing lip and gum. Synonym: labiodental sulcus, lip sulcus, primary labial groove. (05 Mar 2000) |
| primitive groove | The median depression in the primitive streak flanked by the primitive ridges. Synonym: primitive furrow. (05 Mar 2000) |
| 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) |