#duct__canal__channel  a bodily passage or tube conveying a secretion or other substance
  supertype:  #passage.anatomical_structure__passageway  a path or channel or duct through or along which something may pass; "the nasal passages"
  part:  #ampulla.body_part
  subtype:  #pore.duct  any small opening in the skin or outer surface of an animal
     subtype:  #ostiole  a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass
  subtype:  #spinal_canal__vertebral_canal__vertebralcanal__canalis_vertebralis__canalisvertebrali  the canal in successive vertebrae through which the spinal cord passes
  subtype:  #ductule__ductulus  a very small duct
     subtype:  #sweat_duct__sweatduct  a small duct that conveys sweat from a sudoriferous gland to the surface of the skin
     subtype:  #biliary_ductule  excretory ducts of the liver; empty into the hepatic ducts
  subtype:  #canaliculus__canaliculu  a small canal or duct as in some bones and parts of plants
  subtype:  #canal_of_Schlemm__Schlemm's_canal__schlemm'scanal__sinus_venosus_sclerae__sinusvenosussclerae  a circular canal in the eye that drains aqueous humor from the anterior chamber of the eye into the anterior ciliary veins
  subtype:  #venous_sinus__sinus__sinu  a wide channel containing blood; does not have the coating of an ordinary blood vessel
     subtype:  #cavernous_sinus__sinus_cavernosus  either of a pair of large venous sinuses in the cranial cavity
     subtype:  #coronary_sinus__sinus_coronarius  a short sinus receiving most of the veins of the heart; empties into the right atrium
     subtype:  #sigmoid_sinus__sigmoidsinu__sinus_sigmoideus  an S-shaped dural sinus on the temporal and occipital bones
     subtype:  #straight_sinus__tentorial_sinus__tentorialsinu__sinus_rectus  an unpaired sinus of the dura mater
     subtype:  #transverse_sinus__sinus_transversus__sinustransversu  a paired dural sinus; terminates in the sigmoid sinus
  subtype:  #lacrimal_duct__lachrymal_duct__lachrymalduct__tear_duct  any of several small ducts that carry tears from the lacrimal glands
  subtype:  #nasolacrimal_duct  a duct that carries tears from the lacrimal sac to the nasal cavity
  subtype:  #Haversian_canal  any of the many tiny canals that contain blood vessels and connective tissue and that form a network in bone
  subtype:  #hepatic_duct__hepaticduct  the duct that drains bile from the liver
  subtype:  #inguinal_canal__canalis_inguinalis  oblique passage through the lower abdominal wall; in males it is the passage through which the testes descend into the scrotum and it contains the spermatic cord; in females it transmits the round ligament of the uterus
  subtype:  #common_bile_duct__bile_duct  a duct formed by the hepatic and cystic ducts; opens into the duodenum
  subtype:  #pancreatic_duct  a duct connecting the pancreas with the intestine
  subtype:  #lymph_vessel__lymphvessel__lymphatic_vessel__lymphaticvessel  a vascular duct that carries lymph which is eventually added to the venous blood circulation
     subtype:  #thoracic_duct  the major duct of the lymphatic system
     subtype:  #lacteal  any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct
  subtype:  #salivary_duct  a duct through which saliva passes from the salivary gland into the mouth
  subtype:  #cerebral_aqueduct__Sylvian_aqueduct__aqueductus_cerebri  a canal connecting the third and fourth ventricles
  subtype:  #ureter  either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder
  subtype:  #urethra  duct through which urine is discharged in most mammals and which serves as the male genital duct
  subtype:  #cervical_canal__canalis_cervicis_uteri  a spindle-shaped canal extending from the uterus to the vagina
  subtype:  #umbilical_cord__umbilicalcord  membranous duct connecting the fetus with the placenta
  subtype:  #vagina  the lower part of the female reproductive tract; a moist canal in female mammals extending from the labia minora to the uterus; "the vagina receives the penis during coitus"; "the vagina is elastic enough to allow the passage of a fetus"
  subtype:  #epididymis  a convoluted tubule in each testis; carries sperm to vas deferens
  subtype:  #vas_deferens__ductus_deferens  a duct that carries spermatozoa from the epididymis to the ejaculatory duct
  subtype:  #seminal_duct__seminalduct  the efferent duct of the testis in man
  subtype:  #ejaculatory_duct__ejaculatoryduct  a part of the seminal duct formed by the duct from the seminal vesicle and the vas deferens; passes through the prostate gland
  subtype:  #alimentary_canal__alimentary_tract__digestive_tube__digestivetube__digestivetract__gastrointestinal_tract__GI_tract  tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
     subtype:  #enteron  the alimentary canal (especially of an embryo or a coelenterate)
  subtype:  #lactiferous_duct__lactiferousduct  ducts of the mammary gland that carry milk to the nipple

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