| sulcus sclerae | A slight groove on the external surface of the eyeball indicating the line of union of the sclera and cornea or limbus of cornea. Synonym: sulcus sclerae, sulcus of sclera. (05 Mar 2000) |
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| sulcus sinus petrosi inferioris | A groove lodging the inferior petrosal sinus, formed by union of similarly named grooves in the petrous part of the temporal bone and the basilar part of the occipital bone. Synonym: sulcus sinus petrosi inferioris, inferior petrosal groove, inferior petrosal sulcus. (05 Mar 2000) |
| sulcus sinus petrosi superioris | A groove on the crest of the petrous portion of the temporal bone in which rests the superior petrosal sinus. Synonym: sulcus sinus petrosi superioris, superior petrosal sulcus. (05 Mar 2000) |
| sulcus sinus sagittalis superioris | 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) |
| sulcus sinus sigmoidei | 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) |
| sulcus sinus transversi | The groove on the inner surface of the occipital bone marking the course of the transverse sinus; the tentorium is attached to its margins. Synonym: sulcus sinus transversi, sulcus for transverse sinus. (05 Mar 2000) |
| sulcus spinosus | A faint groove occasionally caused by the chorda tympani nerve on the spine of the sphenoid. Synonym: Lucas' groove, sulcus spinosus. (05 Mar 2000) |
| sulcus spiralis externus | A concavity in the outer wall of the cochlear duct between the prominentia spiralis and the spiral organ. Synonym: sulcus spiralis externus. (05 Mar 2000) |
| sulcus spiralis internus | A concavity in the floor of the cochlear duct formed by the overhanging labium vestibulare. Synonym: sulcus spiralis internus. (05 Mar 2000) |
| sulcus subclavianus | 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) |
| sulcus subclavius | <anatomy, artery> A sulcus on the surface of the lung just below the apex, corresponding to the course of the subclavian artery. Synonym: sulcus subclavius. (05 Mar 2000) |
| sulcus subparietalis | A sulcus continuing the direction of the cingulate sulcus from where the marginal part of that fissure bends upward; it forms the upper boundary of the posterior portion of the cingulate gyrus. Synonym: sulcus subparietalis. (05 Mar 2000) |
| sulcus supra-acetabularis | 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) |
| sulcus tali | The groove on the inferior surface of the talus, which with a corresponding groove on the calcaneus forms the sinus tarsi. Synonym: sulcus tali, interosseous groove, talar sulcus. (05 Mar 2000) |
| sulcus temporalis inferior | The sulcus on the basal aspect of the temporal lobe that separates the fusiform gyrus from the inferior temporal gyrus on its lateral side. Synonym: sulcus temporalis inferior, Clevenger's fissure. (05 Mar 2000) |