cleft

A fi ure, anal c, c. of the nates. The space between the nates [B. N. A., creva anil. c. of the vulva. The c. between the labia major a. hyomandibular c. The first, or uppermost, of the visceral c's of the embryo. It takes part in the development of the ear and lies between the mandibular and hyoid arches, maxillo -intermaxillary c. A fi ure between the maxillary and intermaxillary matrices (the front on a sal maxillary plates) in the fetus. If by arrest of development it persists, it gives rise to cleft palate, ocular c. A fi ure between the front on a sal proce and the superior maxillary plate, leading from the mouth up to the eye in the embryo. pharyngeal c's. See visceral c's. primitive cerebral c. In the embryo, a decided sinking of the cerebral roof separating the prosencephalon from the thalamencephalon. pro to vertebral c's. Fi ures between the pro to vertebral segments or somites, sclerotic c. A c. in the lower part of the fetal sclerotic, into which a proce of the ectoderm projects to form the vitreous, tympanoeustachian c. See hyomandibular c. visceral c's. C's situated between the postoral visceral arches, one on each side, running through the wall of the body from the external surface into the cavity of the pharynx. [Mid. Eng., clyft, crevice, chink.]