. The science and practice of dental surgery. —Hiiman embryo of about three weeks,showing the visceral arclies and clefts (after Quain). S, StomatodEieum; O, Olfactory depression; CV,Cerebral vesicles; H, Heart; TA, Truncus arteri-osus ; A^, Aortic branch of first visceral arch;VC, Visceral cleft (first); OV, Otic vesicle; JV,Jugular vein; CV, Cardinal vein; DC, Duct ofCuvier; W, Vitelline vein ; UV, tjmbUical vein;UA, Umbilical artery; All, Allantois; P, Placenta;PS, Primitive mesodermal somite; nf, Naso-frontalprocess; »i. Maxillary process; md, Mandibularprocess. crest or ectodermic tliicke
. The science and practice of dental surgery. —Hiiman embryo of about three weeks,showing the visceral arclies and clefts (after Quain). S, StomatodEieum; O, Olfactory depression; CV,Cerebral vesicles; H, Heart; TA, Truncus arteri-osus ; A^, Aortic branch of first visceral arch;VC, Visceral cleft (first); OV, Otic vesicle; JV,Jugular vein; CV, Cardinal vein; DC, Duct ofCuvier; W, Vitelline vein ; UV, tjmbUical vein;UA, Umbilical artery; All, Allantois; P, Placenta;PS, Primitive mesodermal somite; nf, Naso-frontalprocess; »i. Maxillary process; md, Mandibularprocess. crest or ectodermic tliickening of the medullarygroove, the earliest representative of a centralnervous system in the embryo (see Figs. 6, 7). The mcsodermic tissue of the visceral archesbecomes differentiated into connective tissue,and this constitutes the membranous stage of theJaw, the remaining mesoderroic tissue forming the muscular and connective tissues around thejaw (see Fig. 17). Cartilage develops in eachof the visceral arches; the cartilaginous bar of MX. Fig. 11.—I. Lateral aspect of the head of a humanembryo about a month old, showing the olfactorypit and the visceral arches and clefts (from His).Olfactory pit; E, Eye; MX, Maxillary process;MX), Mandibular process; H, Hyoid arch; OV,Otic vesicle; P, Prosencephalon; T, Thalamen-cephalon; M, Mesencephalon. OP,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
