Tympanic cavity Health Dictionary

The ear-drum, which separates the external and middle ear. (See EAR.)... tympanic membrane

The normally restricted space between the parietal and the visceral PLEURA, which slide over one another as the individual breathes in and out. If gas or ?uid are introduced as a result of injury or infection, the pleural surfaces are separated and the pleural space increases in volume. This usually causes breathing diffculties.... pleural cavity

The digestive system of the cnidarian, consisting of the stomach and its connecting canals which perform a similar task to vascular system of higher orders.... gastrovascular cavity

A hole in a tooth, commonly caused by dental caries (see caries, dental).... cavity, dental

the fluid-filled cavity between the embryo and the *amnion. It forms initially within the inner cell mass of the *blastocyst and later expands over the back of the embryo, eventually enclosing it completely. See also amniotic fluid.... amniotic cavity

the cavity of the mouth, which contains the tongue and teeth and leads to the pharynx. Here food is tasted, chewed, and mixed with saliva, which begins the process of digestion.... buccal cavity

n. 1. (in anatomy) a hollow enclosed area; for example, the abdominal cavity or the buccal cavity (mouth). 2. (in dentistry) a. the hole in a tooth caused by *caries or abrasion. b. the hole shaped in a tooth by a dentist to retain a filling.... cavity

(in dentistry) a solution of natural or synthetic resin in an organic solvent. It is used to provide a barrier against the passage of irritants from restorative materials and to reduce the penetration of oral fluids into the underlying *dentine.... cavity varnish

see acetabulum.... cotyloid cavity

(glenoid fossa) the socket of the shoulder joint: the pear-shaped cavity at the top of the *scapula into which the head of the humerus fits.... glenoid cavity

the space inside the nose that lies between the floor of the cranium and the roof of the mouth. It is divided into two halves by a septum: each half communicates with the outside via the nostrils and with the nasopharynx through the posterior nares.... nasal cavity

the mouth.... oral cavity

the chest cavity. See thorax.... thoracic cavity