sul'cus, gen. and pi. sul'ci

[L. a. furrow or ditch.] r. One of the grooves or furrows on the surface of the brain, bounding the several convolutions or gyri, a fi ure. 2. Any long narrow groove, furrow, or slight depre ion. groove on the external surface of that part of the ampulla of each semicircular duct of the labyrinth which corresponds to the convex side of the duct, it is where the nerve enters. the cranial surface of the auricle separating the eminences of the triangular fo a and of the concha. between the cms helicis and the tuberculum supra tragi cum. groove, between the antitragus and the cauda of the helix marking the location of the antitragicohelicine i is sure. on the ventral surface of the pons Varolii in which lies the basilar artery. groove on the outer side of the biceps in the middle of the arm. groove, a furrow on the inner side of the biceps in the middle of the arm. row on the upper surface of the calcaneus giving attachment to the intero eous ligament. cinguli [BNA]. groove* of the sphenoid bone. of the arch formed by the carpal bones. fi ure running obliquely upward and baclcward on the lateral surface of each cerebral hemisphere, between the frontal and parietal lobes. furrows between the gyri or convolutions of the cerebellum. bounding the cerebral gyri or convolutions. groove of the sphenoid bone. fi ure, a fi ure on the mesial surface of the cerebral hemisphere, bounding the upper surface of the gyrus cinguU (callosal convolution); the anterior portion is called the pars subftontalis, the posterior portion, which curves up to the sup crome dial margin of the hemisphere, bounding the para central lobule posteriorly, the pars marginal is. sulcus of Reil, a semicircular fi ure separating the insula fro.m the operculum above, in front, and behind. 969 entricular groove, a groove on the outer surface of le heart marking the division between the auricles itria) and the ventricles. s. cor'por is callo'si [BNA], s. of the corpus callosum, allosal s., a fi ure separating the corpus callosum om the gyrus cinguh above. s. cos'tffi [BNA], a groove in the lower inner border the rib, lodging the intercostal ve els and nerve.: s. cru'ris hel'icis [BNA], groove of the crus of the slix, a transverse fi ure on the cranial surface of the iiricle corresponding to the crus of the helix. s. cu'tis [BNA], groove of the skin, one of a large limber of grooves of variable depth on the surface of le corium. 8. ethmoid a'lis [BNA], ethmoidal sulcus, nasal roove; a groove on the inner surface of each nasal one, lodging the internal nasal or anterior ethmoidal erve. s. fimbriodenta'tus, fimbriodentate s., a groove epa rating the fimbria from the fascia dentata hippoampi. s. front a'lis, frontal groove; the continuation on he cerebral surface of the frontal bone of the sagittal ulcus. s. front a'lis infe'rior [BNA], inferior frontal s., a igittal fi ure on the outer surface of each frontal lobe f the cerebrum separating the middle from the inferior rental gyrus. s. front a'lis me'dius^ middle or median frontal s.,.n imperfectly developed sagittal fi ure dividing the diddle frontal convolution into an upper and a lower lart; this s. is found only in man and the anthropoid.pes; at its anterior extremity it bifurcates, the two )ranches spreading out laterally and constituting the rontontarginal s. s. front a'lis supe'rior [BNA], superior frontal s., a agittal fi ure on the superior surface of each frontal jhe of the cerebrum, starting from the anterior border f the anterior central s.; it forms the outer boundary f the superior frontal convolution. s. frontomargina'lis, see s. frontal is medius. s. glutEe'us [BNA], gluteal furrow, the furrow beween the buttock and thigh. s. ham'uli pterygoid'ei [BNA], hamular groove, a Toove at the base of the hamular proce which forms pulley for the tendon of the tensor veli palatini. s. horizonta'lM cerebel'li [BNA], horizontal sulcus tf the cerebellum, great horizontal fi ure, a deep cleft tncircling the circumference of the cerebellum, and eceiving the three cerebellar peduncles anteriorly. s. hypothalam'icus [BNA], hypothalamic s., s. of /Tonroe, a aroove in the lateral wall of th'^ third venricle on either side leading from the foramen interentriculare to the adit us ad aquaeductum cerebri. s. infraorbital!s [BNA], infraorbital groove; a graduUy deepening groove on the orbital surface of the laxilla, which leads to the infraorbital canal. s. infrapalpefara'lis [BNA], the hollow or furrow elow the lower eyelid. s. inter me'dius ante'rior [BNA], anterior inter mel i ate sulcus, anterior para median groove, an occasional urrow between the anterior median fi ure and the -nterior lateral sulcus of the spinal cord, usually presnt only in the fetus, indicating the lateral border of he anterior cerebrospinal fasciculus. s. inter me'dius poste'rior [BNA], posterior interned i ate sulcus, posterior para median furrow or groove, longitudinal furrow between the posterior median,,nd the posterior lateral sulci of the spinal cord in the ervical region, separating the funiculus gracilis from he funiculus cuneatus. inter par i eta'lis [BNA], inter parietals., intra paries. al s. of Turner, a branched fi ure starting from near he lateral (Sylvian) fi ure at the posterior border the posterior central gyrus, and running obhquely >f )ackward and medially to terminate in the transverse iccipital sulcus; it separates the superior and inferior )arietal lobules; a horizontal branch proceeds medially orming the posterior boundary of the posterior central [yrus. inter tubercula'ris [BNA], inter tubercular sulcus, s. groove, a furrow running down the shaft of )icipital he humerus from between the two tuberosities, lodgng the tendon of the long head of the biceps, and