canal (ka-nal')

A channel, tube, duct; a long narrow pa age. In dentistry, the tubal cavity, extending the length of the roots of the teeth and containing the branches of the dental pulp, acce ory posterior palatine c's. One or two small c's often found in the horizontal plate of the palate bone near the groove entering into the formation of the posterior palatine c. alimentary c. The whole digestive tube, from the mouth to the anus, anal c. The c. leading from the rectum to the external opening of the anus, corresponding in length to the thickne of the pelvic floor, anterior dental c. A c. of the superior maxilla, which runs down into the facial _ portion of the bone and conveys the anterior dental ve els and nerves, anterior ethmoidal c, anterior internal orbital c. A c. formed between the ethmoid and frontal bones, transmitting the nasal branch of the ophthalmic nerve and the anterior ethmoidal ve els. arachnoid c. A space formed beneath the arachnoid membrane of the brain, as it cro es the transverse and longitudinal fi ures; it lodges the venae magnae Galeni. c. of the cervix uteri. That portion of the uterine c. which extends from the os externum to the os internum, c. of the epididymis. A convoluted tube, constituting the epididymis and continued as the vas deferens, c. of Huguier. See canclis chordae tympani, under canal is. c. of Nuck. A pouch of peritoneum, which, in the female fetus, descends for a short distance along the round ligament of the uterus into the inguinal c; the analogue to the proce us vaginal is in the male. It sometimes persists after birth, c. of Petit. A supposed c. (properly a space intersected by numerous fine interlacing fibers) existing between the anterior and posterior laminae of the suspensory ligament of the crystalline lens, c's of Rivinus. The ducts of the sublingual glands. c. of Schlemm. Syn.: sinus venosus. An irregular space, or plexiform series of spaces, occupying the sclerocorneal region of the eye, regarded by some authorities as a venous sinus, by others as a lymph channel, carotid c. The c. in the petrous portion of the temporal bone for the transmi ion of the internal carotid artery. cartilage c's. The c's, or channels, formed in cartilage during its o ification, to receive prolongations of the osteogenetic layer of the periosteum, central c. of the modiolus. A c. running from the base to the apex of the modiolus of the cochlea, central c. of the spinal cord. The small c. which extends through the center of the spinal cord from the conus medullarr to the lower part of the fourth ventricle, where it expands at the calamus script or i us. cervical c. See c. of the cervix uteri, cochlear c. The spiral cavity or c. of the cochlea, the base of which is turned inward toward the internal auditory meatus and the apex outward toward the tympanum, connecting c. The arched, often coiled, part of a uriniferous tubule joining with a collecting tubule, convoluted c. See convoluted tubule, under tubule. Corti's C.