| canal | A duct or channel; a tubular structure. A canal or channel. See: canal, duct. Synonym: canalis. Origin: L. Canalis (05 Mar 2000) |
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| canal of Guyon | Passageway through the transverse carpal ligament by which the ulnar nerve and artery enter the palm; it is closely related to the pisiform and the hook of the hamate. (05 Mar 2000) |
| canal of Hering | A ductule occurring between a bile canaliculus and an interlobular bile duct. Synonym: canal of Hering. Origin: chol-+ G. Angeion, vessel, + -ole, small (05 Mar 2000) |
| canal of Hovius | An anastomotic circle between the anterior twigs of the venae vorticosae in the eyes of some animals, but not in normal human eyes. (05 Mar 2000) |
| canal of Nuck | A peritoneal diverticulum in the embryonic lower anterior abdominal wall that traverses the inguinal canal; in the male it forms the tunica vaginalis testis and normally loses its connection with the peritoneal cavity; a persistent processus vaginalis in the female is known as the canal of Nuck. Synonym: Nuck's diverticulum, processus vaginalis peritonei, vaginal process of peritoneum, vaginal process of testis. (05 Mar 2000) |
| canales | Plural of canalis. (05 Mar 2000) |
| canales alveolares | Canals in the body of the maxilla that transmit nerves and vessels from the alveolar foramina to the maxillary teeth. Synonym: canales alveolares, alveolodental canals, dental canals. (05 Mar 2000) |
| canales diploici | Channels in the diploe that accommodate the diploic veins. Synonym: canales diploici, Breschet's canals. (05 Mar 2000) |
| canales longitudinales modioli | Centrally placed channels that convey vessels and nerves to the apical turns of the cochlea. Synonym: canales longitudinales modioli, central canals of cochlea. (05 Mar 2000) |
| canales palatini minores | Canalis's located in the posterior part of the palatine bone. Synonym: canales palatini minores. (05 Mar 2000) |
| canales saemicirculares anterior | Anterior saemicurcular canal. See: bony saemicircular canals. (05 Mar 2000) |
| canales saemicirculares lateralis | Lateral saemicircular canal. See: bony saemicircular canals. (05 Mar 2000) |
| canales saemicirculares ossei | The three bony tubes in the labyrinth of the ear within which the membranous saemicircular ducts are located; they lie in planes at right angles to each other and are known as anterior saemicircular canal, posterior saemicircular canal, and lateral saemicircular canal. Synonym: canales saemicirculares ossei. (05 Mar 2000) |
| canales saemicirculares posterior | Posterior saemicircular canal. See: bony saemicircular canals. (05 Mar 2000) |
| canalicular | Relating to a canaliculus. Origin: L. Canaliculus, small channel, dim. Fr. Canalis, canal, + suffix -ar, pertaining to (05 Mar 2000) |
| abdominal canal | A passage in the lower anterior abdominal wall which in the male allows passage of the spermatic cord and in the female contains the round ligament. Because of the weakness it creates in the abdominal wall, it is the most frequent site for a hernia. (12 Dec 1998) |
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| accessory canal | A channel leading from the root pulp laterally through the dentin to the periodontal tissue; may be found anywhere in the tooth root, but is more common in the apical third of the root. Synonym: lateral canal. (05 Mar 2000) |
| adductor 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) |
| Alcock's canal | The space within the obturator internis fascia lining the lateral wall of the ischiorectal fossa that transmits the pudendal vessels and nerves. Synonym: canalis pudendalis, Alcock's canal. (05 Mar 2000) |
| alimentary canal | <anatomy> The digestive tract. (27 Sep 1997) |
| anal canal | The terminal portion of the alimentary canal; it extends from the pelvic diaphragm to the anal orifice. Synonym: canalis analis. (05 Mar 2000) |
| anterior condyloid canal of occipital bone | The canal through which the hypoglossal nerve emerges from the skull. Synonym: canalis hypoglossalis, anterior condyloid canal of occipital bone, anterior condyloid foramen. (05 Mar 2000) |
| archenteric canal | Invagination of the blastopore into the notochordal process to form a cavity. See: neurenteric canal. Synonym: notochordal canal. (05 Mar 2000) |
| Arnold's canal | <anatomy, nerve> The small opening in the petrous bone lateral to the hiatus of facial canal that gives passage to the lesser petrosal nerve. Synonym: hiatus canalis nervi petrosi minoris, Arnold's canal, canalis nervi petrosi superficialis minoris. (05 Mar 2000) |
| arterial canal | Before birth, the blood headed from the heart (via the pulmonary artery) for the lungs is shunted away from the lungs and returned to the greatest of arteries (the aorta). The shunt is through a short vessel called the ductus arteriosus. When the shunt is open, it is said to be patent (pronounced pa'tent). The patent ductus arteriosus (PDA) usually closes at or shortly after birth and blood is permtted from that moment on to course freely to the lungs. If the ductus stays open (patent), flow reverses and blood from the aorta is shunted into the pulmonary artery and recirculated through the lungs. The PDA may close later spontaneously (on its own) or need to be ligated (tied off) surgically. (12 Dec 1998) |
| artery of pterygoid canal | Usually arises from the third part of the maxillary artery, but frequently from the greater palatine artery, within the pterygopalatine fossa. Passes posteriorly to run through the pterygoid canal with the corresponding nerve, supplying the contents and wall of the canal, the mucous membrane of the upper pharynx, the auditory tube and the tympanic cavity. Synonym: arteria canalis pterygoidei, vidian artery. (05 Mar 2000) |
| atrial ventricular canal defect | A defect caused by deficient or absent septal tissue immediately above and below the normal level of the atrioventricular valves, including the region normally occupied by the A-V septum in hearts with two ventricles. The A-V valves are abnormal to a varying degree. (05 Mar 2000) |
| atrioventricular canal | The canal in the embryonic heart leading from the common sinuatrial chamber to the ventricle. (05 Mar 2000) |
| atrioventricular canal cushions | A pair of mounds of embryonic connective tissue covered by endothelium, bulging into the embryonic atrioventricular canal; located one dorsally and one ventrally, they grow together and fuse with each other and with the lower edge of the septum primum, dividing the originally single canal into right and left atrioventricular orifices. Synonym: endocardial cushions. (05 Mar 2000) |
| auditory canal | The passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane; it consists of a bony (inner) portion and a fibrocartilaginous (outer) portion, the cartilaginous external acoustic meatus. Synonym: meatus acusticus externus, acoustic meatus, antrum auris, auditory canal, external auditory meatus. (05 Mar 2000) |