. The science and practice of dental surgery. Fig. 15. — Diagram showing the relation of theteeth to tlie oral clefts. The left side of thediagram represents the normal arrangement ofthe teeth and the right side, a condition frequentlypresent in complete hare-lip. nf, Naso-frontal process; In, Lateral nasal process;mx. Maxillary process; md. Mandibular process;1^, 1-, C, P, V, M, M^, M^, the Permanent teeth;S,Supernumerary tooth. Note absence of lateralincisor on right side of diagram. The visceral clefts are botnided above andbelow by the rounded bars of tissue known asthe vnsceral arches (Fi
. The science and practice of dental surgery. Fig. 15. — Diagram showing the relation of theteeth to tlie oral clefts. The left side of thediagram represents the normal arrangement ofthe teeth and the right side, a condition frequentlypresent in complete hare-lip. nf, Naso-frontal process; In, Lateral nasal process;mx. Maxillary process; md. Mandibular process;1^, 1-, C, P, V, M, M^, M^, the Permanent teeth;S,Supernumerary tooth. Note absence of lateralincisor on right side of diagram. The visceral clefts are botnided above andbelow by the rounded bars of tissue known asthe vnsceral arches (Fig. 16). The first visceral or branchial cleft normally. EP L Fig. 16.—Showing the front wall or floor of pharynxin a human embryo at the fourth week {after Hist.) 1, 2, 3, 4, 5, The five visceral arches; MD, Mandibularor first arch; HA, Hyoid or second arch; T,Region of trimk; CM, Cleft membrane (first);E, Ectoderm; H, Entoderm; TI, Tubercuhuiiimpar, which forms part of the anterior portion oftongue; LT, Lateral tubercles; FC, Foramencaecvun; PT, Posterior or pharyngeal portion > ftongue (copula); EP, Epiglottis; L, Larynx; SP,Sinus praecervicalis (formed by a sinking in ofthe lower arches and clefts and the more rapidgrowth of the second arch), the sinus or fossa issubsequently obliterated by the coalescence of itsmargins (HA and T). persists, and is represented by the external ear,the middle ear, and the auditory tube; the ex-ternal ear representing tlie ectodermic evagina-tion of this cleft, and the auditory tube andthe middle ear representing the entodermicevagination. This explains why the external ear (ectodermic development) is
Size: 1929px × 1295px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
