| hiatus sacralis | A normally-occurring gap at the lower end of the sacrum, exposing the vertebral canal, due to failure of the laminae of the last sacral segment to coalesce. It is closed by the sacrococcygeal ligament, and provides cannular access to the sacral epidural space for administration of anaesthetics (caudal nerve blocks). Synonym: hiatus sacralis. (05 Mar 2000) |
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| hiatus totalis sacralis | Developmental clefting in all sacral vertebrae; may also involve adjacent lumbar vertebrae. (05 Mar 2000) |
| tuberositas sacralis | A rough prominence on the lateral surface of the sacrum posterior to the auricular surface for attachment of posterior sacroiliac ligaments. Synonym: tuberositas sacralis. (05 Mar 2000) |
| flexura sacralis recti | The anteroposterior curve with concavity anteriorward of the first portion of the rectum. Synonym: flexura sacralis recti. (05 Mar 2000) |
| wing of crista galli | A small lateral expansion of the ethmoid bone from the front of the crista galli on each side that articulates with the frontal bone and forms the foramen caecum. Synonym: ala cristae galli, alar process. (05 Mar 2000) |
| crista | Synonym: crest. Origin: L. Crest (05 Mar 2000) |
| crista ampullaris | An elevation on the inner surface of the ampulla of each saemicircular duct; filaments of the vestibular nerve pass through the crista to reach hair cells on its surface; the hair cells are capped by the cupula, a gelatinous protein-polysaccharide mass. Synonym: crista ampullaris, acoustic crest, transverse septum. (05 Mar 2000) |
| crista arcuata cartilaginis arytenoideae | The ridge on the anterior surface of the arytenoid cartilage that separates the triangular from the oblong fovea. Synonym: crista arcuata cartilaginis arytenoideae, arched crest, arcuate crest. (05 Mar 2000) |
| crista basilaris ductus cochlearis | An inward projection of the spiral ligament of the cochlea to which is attached the basilar membrane forming the floor of the cochlear duct. Synonym: crista basilaris ductus cochlearis. (05 Mar 2000) |
| crista buccinatoria | A ridge passing from the base of the coronoid process of the mandible to the region of the last molar tooth; it gives attachment to the mandibular part of the buccinator muscle. Synonym: crista buccinatoria. (05 Mar 2000) |
| crista capitis costae | The ridge that separates the superior and inferior articular surfaces of the head of a rib. Synonym: crista capitis costae. (05 Mar 2000) |
| crista colli costae | The sharp upper margin of the neck of a rib. Synonym: crista colli costae. (05 Mar 2000) |
| crista conchalis | Bony ridge which articulates with, or provides attachment for, the inferior nasal concha. See: conchal crest of maxilla, conchal crest of palatine bone. Synonym: crista conchalis, turbinated crest. (05 Mar 2000) |
| crista conchalis maxillae | Ridge of the nasal surface of the body of the maxilla that articulates with the inferior nasal concha. Synonym: crista conchalis maxillae. (05 Mar 2000) |
| crista conchalis ossis palatini | The ridge on the nasal surface of the perpendicular part of the palatine bone to which the inferior nasal concha attaches. Synonym: crista conchalis ossis palatini. (05 Mar 2000) |