crest

A ridgelike structure, canine c. An elevation upon the maxilla over the situation at the root of the canine tooth, c. of the ilium. The thickened upper border of the ilium, c. of the pubes, c. of the pubic bone. A rough ridge upon the upper border of the pubic bone. c. of the sacrum. A longitudinal c, situated in the median line, on the posterior surface of the sacrum, consisting of a series of eminences representing the spinous proce es of the vertebrae, c. of the tibia. The sharp anterior border of the tibia, dental c. See gingival c. ethmoidal c. 1. A transverse ridge upon the inner surface of the nasal proce of the superior maxilla against which the anterior portion of the lateral ma of the ethmoid bone fits. 2. See superior turbinate c. external occipital c. A ridge which extends in the middle line between the posterior margin of the foramen magnum and the external occipital protuberance of the occipital bone, frontal c. A ridge upon the cerebral surface of the frontal bone which extends between the foramen cecum and the anterior end of the groove of the longitudinal sinus, gingival c. A whitish gray, hard, sharp projection formed by the gingival mucous membrane of the edentulous fetus along the line subsequently to be occupied by the teeth; composed of vascular fibrous ti ue, iliac c. See c. of the ilium. inferior turbinate C. A horizontal ridge of the nasal surface of the maxilla for articulation with the inferior turbinal bone, infra temporal c. A ridge on the external surface of the greater wing of the sphenoid bone, internal occipital c. A ridge on the internal surface of the occipital bone, extending between the posterior margin of the foramen magnum and the internal occipital protuberance. lacrimal c's. i. The inner sharp edge of the lacrimal groove of the maxilla. 2. The vertical ridge upon the outer surface of the lacrimal bone which divides it into two unequal parts, nasal c. 1. A c. on the palatal proce of the maxilla, which receives the lower border of the vomer. 2. The vertical prolongation backward of the internal surface of the nasal bone which forms a portion of the nasal septum, neural c. In the embryo, a series of cellular swellings continuous with the medullary plates close to the place of inflection of the epiblast into the involution that forms the primary brain and spinal cord. The posterior roots of the spinal nerves and most of the cranial nerves are formed from them, orbital c. The lower rounded margin of the orbital surface of the sphenoid bone. sphenoidal c. A thin projecting edge of bone in the middle line of the anterior surface of the body of the sphenoid bone. superior turbinate c. A ridge upon the internal surface of the vertical plate of the palate bone which articulates with the middle turbinate bone, temporal c. Syn.: line a frontal is. A c. on the frontal bone which springs from the external angular proce and pa es backward to be continuous with the temporal line of the parietal bone, and separates the temporal and frontal portions of the bone. turbinate c. See inferior turbinate c. and superior turbinate c. zygomatic c. The anterior edge of the ala magna of the sphenoid bone, which articulates with the malar bone and separates the orbital and temporal surfaces. [B. N. A., crista.] [Lat, crista, tuft, plume.]