Contains

• mouth

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

• rima

  A narrow elongated opening or fissure between two symmetrical parts.

• anus

  The excretory opening at the end of the alimentary canal.

• fenestra

  A small opening covered with membrane (especially one in the bone between the middle and...

• soft spot

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

• spiracle

  A breathing orifice.

• naris

  Any of the openings to the nasal cavities that allow air to flow through the cavities to the...

• cervix

  Necklike opening to the uterus.

• pylorus

  A small circular opening between the stomach and the duodenum.

• vent

  External opening of urinary or genital system of a lower vertebrate.

• aortic orifice

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

• stoma

  A mouth or mouthlike opening (especially one created by surgery on the surface of the body...

• urethral orifice

  The orifice through which urine is discharged.

• porta hepatis

  Opening for major blood vessels to enter and leave the liver.

• introitus

  Entrance or opening to a hollow organ or tube (especially the vaginal opening); "the introitus...

• blastopore

  The opening into the archenteron.

• cardia

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

• os

  A mouth or mouthlike opening.