division

See direct c. division, annular c. A vegetable c. in which there are one or more annular thickenings of the c. wall upon its inner surface. These and other markings, such as scalform and porous, belong rather to ve els than to single cells, ve els being made up of a number of c's which have lost their individual markings, anterior ethmoid c's. The air cells in the ethmoid bone, closed in by the lacrymal bone and the frontal proce of the maxilla, apolar c. A nerve c, especially of the sympathetic system, described as po e ing no nerve proce es, asexual reproductive c. A c. which reproduces itself (i. e., forms new c's) without the stimulus of contact or conjugation with any other a; e. g., a c. which produces new c's by fi ion or by spore formation, basal c, basilar c. 1. In the pi., basal c's, a term used to designate in a general sense the deepest layer of an epithelium. 2. A