Mathematics. the identity element of a group in which the operation is addition. (of a function, especially of a function of a complex variable) a point at which a given function, usually a function of a complex variable, has the value zero; a root.
Mucosa buccalis. The inner lining of the cheeks and lips, which is an anatomic region that includes all the mucous membrane lining of the inner surface of the cheeks and lips, from the line of contact of the opposing lips to the line of attachment of mucosa to the alveolar ridges and pterygomandibular raphe, which occupies an area of 50â60 cm2.
buccal cavity - the cavity between the jaws and the cheeks. gingiva, gum - the tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth. palate, roof of the mouth - the upper surface of the mouth that separates the oral and nasal cavities.