| SFEMG | single fiber electromyography |
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| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
| SID | single intradermal [test]; Society for Investigative Dermatology; sucrase-isomaltase deficiency; sud... |
| SIMA | single internal mammary artery |
| SIR | single isomorphous replacement; specific immune release; standardized incidence ratio; syndrome of i... |
| nerve of pterygoid canal | The nerve constituting the parasympathetic and sympathetic root of the pterygopalatine ganglion; it is formed in the region of the foramen lacerum by the union of the greater superficial petrosal and the deep petrosal nerves, and runs through the pterygoid canal to the pterygopalatine fossa. Synonym: nervus canalis pterygoidei, radix facialis, facial root, vidian nerve. (05 Mar 2000) |
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| Stilling's canal | A minute canal running through the vitreous from the discus nervi optici to the lens, containing in foetal life a prolongation of the central artery of the retina, the hyaloid artery. See: vitreous, hyaloid artery. Synonym: canalis hyaloideus, central canal of the vitreous, Cloquet's canal, Stilling's canal. (05 Mar 2000) |
| neural canal | The canal within the embryonic neural tube; the primordium of the central canal. (05 Mar 2000) |
| neurenteric canal | A transitory communication between the neural tube, notochordal canal, and gut endoderm in vertebrate embryos, including humans. (05 Mar 2000) |
| subsartorial canal | The space in middle third of the thigh between the vastus medialis and adductor muscles, converted into a canal by the overlying sartorius muscle. It gives passage to the femoral vessels and saphenous nerve, ending at the adductor hiatus. Synonym: canalis adductorius, Hunter's canal, subsartorial canal. (05 Mar 2000) |
| notochordal canal | Invagination of the blastopore into the notochordal process to form a cavity. See: neurenteric canal. Synonym: notochordal canal. (05 Mar 2000) |
| nutrient canal | A canal in the shaft of a long bone or in other locations in irregular bones through which the nutrient artery enters a bone. Synonym: canalis nutricius. (05 Mar 2000) |
| deferent canal | The secretory duct of the testicle, running from the epididymis, of which it is the continuation, to the prostatic urethra where it terminates as the ejaculatory duct. Synonym: deferent canal, deferent duct, spermatic duct, spermiduct, testicular duct, vas deferens. (05 Mar 2000) |
| descending part of facial canal | Second portion of the facial canal, after the horizontal parts, beginning at the posterior end of the lateral crus where the canal begins to descend. It runs vertically downward, ending at the stylomastoid foramen. Anteriorly, the descending part of the facial canal communicates with the tympanic cavity via the canaliculus for the nerve to the stapedius muscle and the posterior canaliculus of the chorda tympani. (05 Mar 2000) |
| Dorello's canal | A bony canal sometimes found at the tip of the temporal bone enclosing the abducens nerve and inferior petrosal sinus as these two structures enter the cavernous sinus. (05 Mar 2000) |
| Dupuytren's canal | <anatomy, vein> One of the veins in the diploe of the cranial bones, connected with the cerebral sinuses by emissary veins; the main diploic veins are the frontal, anterior temporal, posterior temporal, and occipital. Synonym: vena diploica, Breschet's vein, Dupuytren's canal. (05 Mar 2000) |
| incisive canal cyst | A cyst in or near the incisive canal, arising from proliferation of epithelial remnants of the nasopalatine duct; the most common maxillary development cyst. Synonym: median anterior maxillary cyst, nasopalatine duct cyst. (05 Mar 2000) |
| incisor canal | One of several bony canals leading from the floor of the nasal cavity into the incisive fossa on the palatal surface of the maxilla; they convey the nasopalatine nerves and branches of the greater palatine arteries which anastomose with the septal branch of the sphenopalatine artery. Synonym: canalis incisivus. (05 Mar 2000) |
| inferior dental canal | The canal within the mandible that transmits the inferior alveolar nerve and vessels. Its posterior opening is the mandibular foramen. Synonym: canalis mandibulae, inferior dental canal. (05 Mar 2000) |
| infraorbital canal | A canal running beneath the orbital margin of the maxilla from the infraorbital groove, in the floor of the orbit, to the infraorbital foramen; it transmits the infraorbital artery and nerve. Synonym: canalis infraorbitalis. (05 Mar 2000) |