| sulcus intermedius anterior | A furrow occasionally seen in the adult between the anterior median fissure and the anterior lateral sulcus of the spinal cord but usually present only in the foetus. It indicates the lateral border of the anterior corticospinal fasciculus. Synonym: anterior intermediate groove, sulcus intermedius anterior. (05 Mar 2000) |
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| sulcus intertubercularis | A furrow running down the shaft of the humerus between the two tubercles, lodging the tendon of the long head of the biceps, and giving attachment in its floor to the latissimus dorsi muscle. Synonym: sulcus intertubercularis, bicipital groove, intertubercular sulcus. (05 Mar 2000) |
| sulcus interventricularis anterior | A groove on the anterosuperior surface of the heart, marking the location of the septum between the two ventricles. Synonym: sulcus interventricularis anterior, crena cordis. (05 Mar 2000) |
| sulcus interventricularis cordis | See: anterior interventricular groove, posterior interventricular groove. (05 Mar 2000) |
| sulcus intragracilis | A fissure between the gracilis minor and gracilis posterior lobuli of the cerebellum. Synonym: sulcus intragracilis. (05 Mar 2000) |
| sulcus intraparietalis | A horizontal sulcus extending back from the postcentral sulcus over some distance, then dividing perpendicularly into two branches so as to form, with the postcentral sulcus, a figure H. It divides the parietal lobe into superior and inferior parietal lobules. Synonym: sulcus intraparietalis, interparietal sulcus, intraparietal sulcus of Turner, Turner's sulcus. (05 Mar 2000) |
| sulcus lacrimalis | The groove in the nasal surface of the maxilla which, together with the lacrimal bone, forms the fossa for the lacrimal sac. Synonym: sulcus lacrimalis. (05 Mar 2000) |
| sulcus lateralis anterior | An indistinct furrow on the ventral surface of the spinal cord and medulla oblongata, on either side marking the line of exit of the anterior nerve roots. Synonym: sulcus lateralis anterior, anterolateral groove. (05 Mar 2000) |
| sulcus lateralis cerebri | The deepest and most prominent of the cortical fissures, extending from the anterior perforated substance first laterally at the deep incisure between the frontal and temporal lobes, then back and slightly upward over the lateral aspect of the cerebral hemisphere, with the superior temporal gyrus as its lower bank, the insula forming its greatly expanded floor. Two short side branches, the ramus anterior and ramus ascendens, divide the inferior frontal gyrus into an orbital part, triangular part, and opercular part. Synonym: sulcus lateralis cerebri, fissura cerebri lateralis, lateral cerebral fissure, sylvian fissure, fissure of Sylvius. (05 Mar 2000) |
| sulcus limitans | The medial longitudinal groove on the inner surface of the neural tube separating the alar and basal plates. Synonym: sulcus limitans. (05 Mar 2000) |
| sulcus limitans fossae rhomboideae | A lateral groove running the whole length of the floor of the rhomboid fossa on either side of the midline, representing the remains of the sulcus demarcating the alar (dorsal) from the basal (ventral) plate of the embryonic rhombencephalon. Synonym: sulcus limitans fossae rhomboideae. (05 Mar 2000) |
| sulcus lunatus cerebri | A small, inconstant semilunar groove on the cortical convexity near the occipital pole, marking the anterior border of the striate cortex (area 17) and considered homologous with the major sulcus of the same name that is a more constant feature of the cerebral cortex in monkeys and apes. Synonym: sulcus lunatus cerebri, ape fissure, lunate fissure, lunate sulcus, simian fissure. (05 Mar 2000) |
| sulcus malleolaris | A broad groove on the posterior surface of the medial malleolus, through which the tendon of the tibialis posterior muscle runs. Synonym: sulcus malleolaris, malleolar sulcus. (05 Mar 2000) |
| sulcus matricis unguis | The cutaneous furrow in which the lateral border of the nail is situated. Synonym: groove of nail matrix, vallecula unguis. (05 Mar 2000) |
| sulcus medialis cruris cerebri | A groove in the lateral wall of the interpeduncular fossa of the midbrain from which the rootlets of the oculomotor nerve emerge. Synonym: sulcus medialis cruris cerebri, sulcus nervi oculomotorii, sulcus of the oculomotor nerve. (05 Mar 2000) |