crissum (krisum)

L. cri are or crisare, move the haunches.] In ornith., the region between the anus and the tail of a bird; especially, the feathers of this region, the vent-feathers or under tail-coverts, collectively. See cut under bird. Cri um is a word constantly used for some indefinite region immediately about the vent; sometimes meaning the flanks, sometimes the vent-feathers or under tail-cov. Coues , Key to N. A. Birds, p. 96. erts proper. crista (kris'tä), n.; pl. crista (-tē). [L., a crest: see crest.] 1. In zoöl. and an at., a crest, in any sense; a ridge, prominence, or proce like or likened to a crest or comb.-2. In ornith., specifically-( a ) The crest of feathers on a bird's head. (b) The keel of the breast-bone of a carinate bird; the crista stern i. - Crista acustica, the acoustic ridge; a ridge in the ampullæ of the ear on which rest the end-organs of audition.Crista del to idea, the deltoid ridge of the humerus. - Crista fornicis, the crest of the fornix, observable in various mammals; a hemispherical or semi-oval elevation of the posterior surface of the fornix just above the rece us aulæ, between the portæ and opposite the fore convexity of the middle commi ure of the brain: continuous with the carina fornicis. Crista gall i, the cockscomb, a protuberance of the mes ethmoid or perpendicular median plate of the ethmoid, above the horizontal or cribriform plate, serving for the attachment of the falx cerebri. See cut under craniofacial. - Crista ilii, the crest of the ilium; in human an at., the long sinuate-curved and arched border of that bone, morphologically its proximal extremity. Crista pectoral is, the pectoral ridge of the humerus, - Crista pubis, the crest of the pubis, the portion of the bone included between the spine of the pubis and the symphysis. Crista stern i, the crest, keel, or carina of the breast-bone of a bird. Crista tibiæ, the crest of the tibia; the cnemial crest or ridge of the shin-bone; the sharp anterior border, or shin, of the bone. - Crista urethræ, the crest of the urethra; a longitudinal fold of mucous membrane and subjacent ti ue on the median line of the floor of the prostatic urethra, about three quarters of an inch in length and one quarter of an inch in height where it is greatest. On the summit open the ejaculatory ducts, Also called colliculus seminal is, caput gall in agin is, and verumontanum. Crista vestibuli, a ridge of bone on the inner wall of the vestibule of the ear, forming the posterior limit of the fovea hem i elliptic a.