#orifice__opening__porta  an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
  supertype:  passage.anatomical_structure__passageway  a path or channel or duct through or along which something may pass; "the nasal passages"
  subtype:  vent  external opening of urinary or genital system of a lower vertebrate
  subtype:  blastopore  the opening into the archenteron
  subtype:  aortic_orifice  the orifice from the lower left chamber of the heart to the aorta
  subtype:  stoma  a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
  subtype:  porta_hepatis__portahepati  opening for major blood vessels to enter and leave the liver
  subtype:  spiracle  a breathing orifice
     subtype:  blowhole  the spiracle of a cetacean located far back on the skull
     subtype:  stigma.spiracle  an external tracheal aperture in a terrestrial arthropod
  subtype:  mouth  the externally visible part of the oral cavity on the face and the system of organs surrounding the opening; "she wiped lipstick from her mouth"
     subtype:  cytostome  mouth of a protozoan
     subtype:  neb__beak__bill__nib__pecker  horny projecting mouth of a bird
     subtype:  beak  beaklike mouth of animals other than birds (e.g., turtles)
  subtype:  os  a mouth or mouthlike opening
  subtype:  uterine_cervix__uterinecervix__cervix__cervix_uteri  necklike opening to the uterus
     subtype:  incompetent_cervix__incompetentcervix  (obstetrics) uterine cervix that becomes dilated before term and without labor often resulting in miscarriage or premature birth
  subtype:  fenestra  a small membrane-covered opening (especially one in the bone between the middle and inner ear)
     subtype:  fenestra_ovalis__fenestra_vestibuli__oval_window__fenestra_of_the_vestibule  fenestra that has the base of the stapes attached to it
     subtype:  fenestra_rotunda__fenestra_cochleae__round_window__roundwindow__fenestra_of_the_cochlea  fenestra leading into the cochlea
  subtype:  cardia  the opening into the stomach and that part of the stomach connected to the esophagus
  subtype:  introitus__introitu  entrance or opening to a hollow organ or tube (especially the vaginal opening); "the introitus of the vagina"
  subtype:  urethral_orifice__external_orifice  the orifice through which urine is discharged
  subtype:  pylorus__pyloru  a small circular opening between the stomach and the duodenum
  subtype:  anus__arse__arsehole__asshole  excretory opening at the end of the alimentary canal
     subtype:  imperforate_anus  a congenital defect of the anus; there is partial or complete obstruction of the anal opening
  subtype:  fontanelle__fontanel__soft_spot  any membranous gap between the bones of the cranium in an infant or fetus
     subtype:  anterior_fontanelle  corresponds to the bregma when bones have ossified
     subtype:  sphenoid_fontanelle__sphenoid_fontanel__sphenoidal_fontanelle__sphenoidal_fontanel  the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified
  subtype:  naris__nari  any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx
     subtype:  nostril__anterior_naris  either one of the two external openings to the nasal cavity in the nose
     subtype:  posterior_naris__posteriornari  either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx
  subtype:  rima  a narrow elongated opening or fissure between two symmetrical parts
     subtype:  oral_cavity__mouth__oral_fissure__rima_oris  the opening through which food is taken in and vocalizations emerge; "he stuffed his mouth with candy"
        subtype:  maw__trap__hole__yap__gob  informal terms for the mouth
     subtype:  pudendal_cleft__urogenital_cleft__rima_pudendi__rima_vulvae__pudendal_cleavage__pudendal_slit__vulvar_slit  the fissure between the labia majora
     subtype:  rima_glottidis__rima_vocalis__true_glottis__glottis_vera__glottisvera  the space between the two true vocal folds
     subtype:  rima_vestibuli__rima_respiratoria__false_glottis__falseglotti__glottis_spuria__glottisspuria  the opening between the false vocal folds

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