. The science and practice of dental surgery. y with the yolk sac bya wide umbilical aperture,^t,;^!, +. -^hZc.~\^^ C, Coelom; EN, Entoderm; SoM, Somatic mesoderm; EC, Ectoderm; M, Moso-umon takes piace oe- derm; SpM, Splanchnic mesoderm ; BP, Buoco-pharyngeal membrane; PA. tween the naso-frontal, ~ ? ? .r, .__ r_ij . ^»t, t,:j „:„. c„,. c.,:.,„i —j.,ii~. lateral nasal, and maxil-lary processes, but insuch a way that thelateral nasal processes fallshare in the formation of Placental area; AF, Amniotic fold; MB, ilid-brain; SpC, Spinal medulla;N, Notochord; RS, Rhomboidal sinus; PS
. The science and practice of dental surgery. y with the yolk sac bya wide umbilical aperture,^t,;^!, +. -^hZc.~\^^ C, Coelom; EN, Entoderm; SoM, Somatic mesoderm; EC, Ectoderm; M, Moso-umon takes piace oe- derm; SpM, Splanchnic mesoderm ; BP, Buoco-pharyngeal membrane; PA. tween the naso-frontal, ~ ? ? .r, .__ r_ij . ^»t, t,:j „:„. c„,. c.,:.,„i —j.,ii~. lateral nasal, and maxil-lary processes, but insuch a way that thelateral nasal processes fallshare in the formation of Placental area; AF, Amniotic fold; MB, ilid-brain; SpC, Spinal medulla;N, Notochord; RS, Rhomboidal sinus; PS, Primitive streak; CM, Cloacalmembrane; H, Heart. short and take nothe free margin of the lips (see Fig. 12). From the naso-frontal the lips and cheek, and by means of itsinternal or lateral prominence the future palate(except that formed by the pre-maxiUa), thus closing off the mouth from the nose (see Fig. 13).The mandibular processes form the mandible,the lower lip, and the chin. The fusion of the internal prominences of. Fig. 6.—Transverse section of the embryonic area of the oviun of a sheepat the end of the second week (after Bonnet). pcj. Primitive groove; ps. Primitive streali; e. Ectoderm; m. Mesoderm;pm. Parietal mesoderm; c, Coelom or primitive body cavity; mesoderm; h, Entoderm; am. Amnion fold. the maxillary processes commences anteriorlyat the eighth week and is completed at theeleventh week. Failure of union of the internal maxillaryprominences results in a cleftpalate, varying in extentfrom a bifid uvula to a cleftextending to the anteriorpalatine foramen, or junctionof the maxiUae and pre-niaxillae. If the naso-frontalprocess on tlie medial aspectand the lateral nasal andmaxillary processes on thelateral aspect also fail tocoalesce, the cleft will extendforwards to one or other sideof the median plane, be-tween tlie segments of thepre-maxilla (?. e. meso- andendo-gnathion), and thusopen into the nostril. Thealveolar portion of the clef
Size: 2234px × 1119px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
