cavum - (anatomy) a natural hollow or sinus within the bodyarchenteron - central cavity of the gastrula; becomes the intestinal or digestive cavity sinus - any of various air-filled cavities especially in the bones of the skull locule, loculus - a small cavity or space within an organ or in a plant or animal lumen - a cavity or passage in a tubular organ; "the lumen of the intestine" socket - a bony hollow into which a structure fits pulp cavity - the central cavity of a tooth containing the pulp (including the root canal) antrum - a natural cavity or hollow in a bone cloaca - (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open vestibule - any of various bodily cavities leading to another cavity (as of the ear or vagina) mediastinum - the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus pleural cavity - the cavity in the thorax that contains the lungs and heart chamber - an enclosed volume in the body; "the chambers of his heart were healthy" amniotic cavity - the fluid-filled cavity that surrounds the developing embryo pericardial cavity, pericardial space - the space between the layers of the pericardium that contains fluid that lubricates the membrane surfaces and allows easy heart movement vacuole - a tiny cavity filled with fluid in the cytoplasm of a cell ventricle - one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid sac - a structure resembling a bag in an animal uterine cavity - the space inside the uterus between the cervical canal and the Fallopian tubes nasal cavity - either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx nasopharynx - cavity forming the upper part of the pharynx oropharynx - cavity formed by the pharynx at the back of the mouth blind gut, caecum, cecum - the cavity in which the large intestine begins and into which the ileum opens; "the appendix is an offshoot of the cecum" chest cavity, thoracic cavity - the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart abdominal cavity, abdomen - the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm renal pelvis, pelvis - a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter |