CANAL 



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CANAL 



on the upper surface of the petrous portion of the tem- 

 poral bone, transmitting the large and small superficial 

 petrosal nerves. C, Plasmatic, i. An Haversian 

 canal. 2. In the Teniadce, canals given off from the 

 longitudinal vessels, containing a homogeneous fluid 

 which is supposed to serve for the nutrition of the 

 animal. C, Poison, in snakes, the canal in the poi- 

 son-fang, serving for the ejaculation of the venom. 

 C, Pore. See C, Porous. C, Porous, in the ovule, 

 supposed to serve for the entrance of the spermato- 

 zoids in fecundation. C, Portal. See Intralobular, 

 Biliary. C, Preputial, in the lower animals, the 

 sheath of the penis. C, Primitive, the neural canal 

 of the embyro. C, Prosodal, in sponges, a canal 

 connecting the chamber with the prosopyle. C, 

 Pseudostomatous, the processes of branched cells 

 that extend from a sub-epithelial or endothelial layer 

 to the free surface, their free ends forming the pseudo- 

 stomata. C, Pterygoid. See C, Vidian. C, Ptery- 

 gopalatine, one formed by the root of the internal 

 pterygoid plate of the sphenoid bone and the sphen- 

 oidal process of the palate bone. It transmits the 

 pterygo-palatine vessels and nerve. C, Pulmo- 

 aortic. See Ductus arteriosus. C, Radial, in the 

 Ctenopkora, two canals that branch off laterally from 

 the funnel. Each divides into two (the secondary 

 radial), which themselves divide into two (the tertiary 

 radial), which open into the ctenophoral canals. C. 

 of Recklinghausen, minute channels supposed to 

 exist in all connective tissue, which are directly con- 

 tinuous with the lymphatic vessels, and hence may be 

 said to form their origin. C. of Reissner. See C, 

 Membranous, of the Cochlea. C, Resin. See C. , 

 Resiniferous. C, Resiniferous, a canal in which 

 resin is secreted. C, Rhachidian. See C, Verte- 

 bral. C. of Rivinus, the duct of the sublingual gland. 

 C. of Rosenthal. See C, Spiral, of the Modiolus, 

 C, Sacculo-cochlear, one connecting the sacculus 

 and the cochlea. C, Sacculo-utricular, one con- 

 necting the sacculus and the utricle. C, Sacral, the 

 continuation of the vertebral canal in the sacrum. 

 C, Sand. See C, Madreporic. C, Santorini's. 

 See C. of Bernard. C. of Schlemm, an irregular 

 space or plexiform series of spaces occupying the 

 sclero-corneal region of the eye ; it is regarded by 

 some as a venous sinus, by others as a lymph-channel. 

 C, Secretory, an interspace between the cells of 

 vegetable tissue, lined with special cells, secreting va- 

 rious products such as oils, balsams, gum-resins, etc. 

 C, Semicircular, bony canals of the labyrinth of the 

 internal ear. They are three in number, the external, 

 superior, and posterior, and contain the membranous 

 semicircular canals. C, Semicircular, Anterior. 

 See C, Semicircular, Superior. C, Semicircular, 

 Anterior Vertical. See C, Semicircular, Superior. 

 C, Semicircular, External, that one of the semicir- 

 cular canals of the labyrinth having its plane horizon- 

 tal and its convexity directed backward. C, Semi- 

 circular, Frontal. See C, Semicircular, Superior. 

 C, Semicircular, Horizontal. See C. , Semicircu- ' 

 lar, External. C., Semicircular, Inferior. See 

 C, Semicircular, Posterior. C, Semicircular, In- 

 ner. See C, Semicircular, Posterior. C, Semicir- 

 cular, Internal. See C, Semicircular, Posterior. 

 C, Semicircular, Lateral. See C, Semicircular, 

 External. C, Semicircular, Osseous. See C, 

 Semicircular. C. , Semicircular, Posterior, that one 

 of the semicircular canals having its convexity directed 

 backward, and its plane almost parallel to the pos- 

 terior wall of the pyramid. C, Semicircular, Pos- 

 terior Vertical. See C, Semicircular, Posterior. 

 C, Semicircular, Sagittal. See C, Semicircular, 



Posterior. C, Semicircular, Superior, that one of 

 the semicircular canals having its convexity directed 

 toward the upper surface of the pyramid. C, Sem- 

 inal, the seminiferous tubules. C., Serous, any mi- 

 nute canal connected with the lymph vessels and sup- 

 posed to be filled with lymph. C, Sheathing, the 

 communication between the cavity of the tunica vagi- 

 nalis of the testicle and the general peritoneal cavity. 

 It soon closes in man, leaving the tunica vaginalis a 

 closed sac. C, Side, blind canals in the ventral skin 

 of amphioxus, supposed to have a urinary function. 

 C, Spermatic. I. The vas deferens. 2. The ingui- 

 nal canal in the male. C, Spheno-palatine. See 

 C. , Pterygo-palatine. C, Spinal. See C, Vertebral. 

 C, Spiral, of the Cochlea, one that runs spirally 

 around the modiolus, taking two turns and a half, 

 diminishing in size from the base to the apex, and 

 terminating in the cupola. C, Spiral, of the Modio- 

 lus, a small canal winding around the modiolus of 

 the base of the lamina spiralis. C, Spiroid, of the 

 Temporal Bone. See Aqueduct of Fallopius. C. 

 of Stenson. See Slenson's Duct. C, Sternal, in 

 the Crtistacea, one formed by the union of the meso- 

 phragms of the endosternites. C. of Stiebel, in cer- 

 tain Mollusca the embryonic renal organ. C. of 

 Stiega. See C. of Laurcr. C. of Stilling. See 

 C. , Hyaloid, and C, Central, of Spinal Cord. C, 

 Stone. See C. , Madreporic. C, Suborbital. See 

 C, Infraorbital. C, Supraorbital, one at the upper 

 margin of the orbit. It transmits the supraorbital ar- 

 tery and nerve. C, Temporal. See C. , Zygomatico- 

 temporal. C, Temporo-malar. See C, Zygo- 

 maiico-temporal. C, Thoracic, the thoracic duct. 

 C, Tympanic, one that opens on the lower surface 

 of the petrous bone, between the carotid canal and 

 the groove for the internal jugular vein. It transmits 

 Jacobson's nerve. C, Urethro-sexual, in some 

 mammals the vagina and urethra combined. C, Urin- 

 ary, the urethra. C, Uro-genital. See Urogenital 

 Sinus. C, Uterine, the canal of the uterus, including 

 the body and neck. C, Utero-cervical, the cavity 

 of the cervix uteri at the time of labor. C, Utero- 

 vaginal. I. The common canal formed by the uterus 

 and vagina. 2. In embryology, the duct of Miiller. 

 C, Vaginal, the canal of the vagina. C, Vascu- 

 lar. See C, Haversian, and C, Cartilage. C, Vec- 

 tor, the oviduct. C, Venous, the ductus venosus. 

 C, Vertebral, the canal formed by the vertebra;. It 

 transmits the spinal cord and its membranes. C, 

 Vertebrarterial, the osseous canal through which the 

 vertebral artery runs. C, Vestibular. See C. , In- 

 current. C, Vidian, a canal of the sphenoid bone 

 at the base of the internal pterygoid plate, opening 

 anteriorly into the spheno-maxillary fossa, and pos- 

 teriorly into the foramen lacerum. It transmits the 

 Vidian nerve and vessels. C, Vitelligene, in com- 

 parative anatomy, canals leading to the vitelligene 

 glands. C, Vitellin, a supposed canal leading from 

 the central cavity of the vitellus, in birds' eggs, to the 

 cicatricula. C, Vulvar, the vestibule of the vagina. 

 C, Vulvo-uterine, the vagina. C, Vulvovag- 

 inal. 1. The vagina and the vulva considered as * 

 single canal. 2. The orifice of the hymen. C, Water- 

 vascular. See C, Aquiferous. C. of Wharton. 

 See Wharton's Duct. C, White, of Malpighi, in 

 insects, two white convoluted urinary tubules open- 

 ing into the large intestine. C. of Wirsung, the 

 pancreatic duct. C. of Wolff. See Wolffian Duct. 

 C, Yellow, of Malpighi, in insects, two yellowish 

 convoluted tubes opening at the junction of the stom- 

 ach and intestine ; they are regarded as urinary. C, 

 Zygomatic. See C, Zygomatico-tcmporal and C, 



