Tectorium

(tek-to' '-re-um). In biology, a covering, as the The Teeth of an Adult. coverts of a bird; also applied The upper section of the illustration represents the upper set, and the lower the lower set. to the membrane of Corti. incisors, I cuspid or canine, 2 premolars or bicuspids, Tectorial (tek-to'-re-al). Serving and 3 molars in each lateral half of each jaw. The as a tectorium, or covering. T. Membrane. See Membrane of Corti. last molar of each half-jaw is cut at an age of from years, and is therefore called a In popular parlance the upper canine teeth are called tris-ez. eye-teeth; the lower canines, stomach-teeth. The upper central incisors are sometimes called butter-teeth Plural of Tec structure the tooth consists of a hard enamel, em trix. In biol the crown; the dentine, within the enamel, c ogy, the feathtuting the whole of the root and interior of tin ers of the wing coverts or tail crown; and the pulp, a bulbous prolongation of coverts of a the mucosa of the gums, which is traversed by blood-! ve els and nerve-filaments. The dentine of the: bird, as dist in root is surrounded by the cement or crusta guished from rem ig e s, and The exposed part of the tooth is the crown, the rectrices. middle part the neck, and the part within the alveoli the fang or root. T., Auditory, the tooth-like Tectrix (tekftriks)., a jections on the edge of the limbus laminae spiral is ol the ear. They extend between the epithelial cover:, Tecand give the limbus an uneven, highly refracting...RM. trices. Covering or hiding. face. They are composed of the osteogenous ti iu Tectrices, the of the crista. T., Numbering of the, in nui plural, applies ing the teeth, the incisor next the symphysis mend 01 to the smaller meson is first, the wisdom-tooth last, or eighth. Tin feathers that first incisor is also said to be central, mes i cover the quill proximal, and the last or wisdom-tooth, distal. It feathers, wings, numbering the groups of teeth, as incisors, bicuspid;! or tail of a or premolars, molars, the one nearest the symphysis i bird. number one of the particular group. T., Temporary: