orifice

external opening of urinary or genital system of a lower vertebrate

the opening into the archenteron

the orifice from the lower left chamber of the heart to the aorta

a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)

opening for major blood vessels to enter and leave the liver

a breathing orifice

the spiracle of a cetacean located far back on the skull

an external tracheal aperture in a terrestrial arthropod

the externally visible part of the oral cavity on the face and the system of organs surrounding the opening

mouth of a protozoan

horny projecting mouth of a bird

beaklike mouth of animals other than birds (e.g., turtles)

a mouth or mouthlike opening

necklike opening to the uterus

(obstetrics) uterine cervix that becomes dilated before term and without labor often resulting in miscarriage or premature birth

a small opening covered with membrane (especially one in the bone between the middle and inner ear)

fenestra that has the base of the stapes attached to it

fenestra leading into the cochlea

the opening into the stomach and that part of the stomach connected to the esophagus

entrance or opening to a hollow organ or tube (especially the vaginal opening)

the orifice through which urine is discharged

a small circular opening between the stomach and the duodenum

the excretory opening at the end of the alimentary canal

vulgar slang for anus

a congenital defect of the anus; there is partial or complete obstruction of the anal opening

any membranous gap between the bones of the cranium in an infant or fetus

corresponds to the bregma when bones have ossified

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

any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx

either one of the two external openings to the nasal cavity in the nose

either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx

a narrow elongated opening or fissure between two symmetrical parts

the opening through which food is taken in and vocalizations emerge

the fissure between the labia majora

the space between the two true vocal folds

the opening between the false vocal folds