Canal is a tubular structure; a channel.
adductor c. An aponeurotic canal in the middle third of the thigh; it contains the femoral artery and vein, and the saphenous nerve.
Alcock’s c. See pudendal canal.
atrioventricular c. The canal in the embryonic heart leading from the common sinoatrial chamber to the ventricle.
auditory c. External; the auditory canal from the concha of the auricle to the tympanic membrane ; in the adult, it is approximately 25 mm in length on its superoposterior wall and 6 mm long on its anteroinferior wall. Also called external auditory meatus.
Internal; a canal through the petrous bone, about 1 cm in length, from the internal auditory foramen to the medial wall of the vestibule and cochlea: it transmits the labyrinthine blood vessels, the vestibulocochlear nerve, and the motor and sensory roots of the facial nerve.
birth c. The cavity of the uterus and vagina through which an infant passes at birth.
Also called parturient canal.
carotid c. A passage through the petrous part of the temporal bone, transmitting the internal carotid artery.
c. of cervix A normally closed, flattened canal within the cervix of the uterus, approximately 2.5 cm in length, connecting the vagina to the cavity within the body of the uterus. Also called cervical canal.
external auditory c. See auditory canal.
femoral c. The medial and smallest of the three compartments of the femoral sheath; it contains some lymphatic vessels and a lymph gland.
incisive c., incisor c. One of two canals opening on either side of the midline in the hard palate, just behind the incisor teeth; through each pass the terminal branches of the descending palatine artery and of the nasopalatine nerve.
inguinal c. An obliquely directed passage through the layers of the lower abdominal
wall on either side, through which pass the spermatic cord in the male and the round ligament of the uterus in the female.
internal auditory c. See auditory canal.
mandibular c. The canal within the mandible containing the inferior alveolar vessels and nerves, from which terminal branches reach the mandibular teeth.
optic c. A short canal through the sphenoid bone at the apex of the which transmits the nerve and ophthalmic artery into the cavity.
pterygoid c. The canal that passes through the root of the pterygoid process of the sphenoid bone.
pudendal c. The fibrous tunnel within the obturator fascia that lines the lateral wall of the ischiorectal fossa; it transmits the pudendal vessels and nerves.
root c., pulp c. The portion of the pulp cavity within the root of a tooth which leads from the apex to the pulp chamber and contains the pulp tissue.
Schlemm’s c. See scleral venous sinus, under sinus.
semicircular c.’s The three bony canals in the internal ear in which the membranous semicircular ducts are located.
tympanic c. See scala tympani, under scala.
vertebral c. The canal formed by the vertebrae, containing the spinal cord.
vestibular c. See scala vestibuli, under scala.