. The science and practice of dental surgery. tivopliaryiix of a third week embryo in sagittal section(after His). FB, Fore-brain ; NF, Naso-frontal process ; MX. Maxil-lary process; MD, Jlandibiilar process ; H, Heart;A, Aorta; 1, 2, 3, 4, Upper four visceral arches;VC, Visceral clefts (second and third); P. Pharynx ;S, Stomatodaeum; OP, Oral plate; DS, Dorsumsellae ; 0, Oesophagus; L, Lung bud; PB-, Buccalportion of hypophysis cerebri; SP, Sessels pouch. wiU involve the soft tissues alone, or in additionthe bone, according to the extent of or excessive union between the m
. The science and practice of dental surgery. tivopliaryiix of a third week embryo in sagittal section(after His). FB, Fore-brain ; NF, Naso-frontal process ; MX. Maxil-lary process; MD, Jlandibiilar process ; H, Heart;A, Aorta; 1, 2, 3, 4, Upper four visceral arches;VC, Visceral clefts (second and third); P. Pharynx ;S, Stomatodaeum; OP, Oral plate; DS, Dorsumsellae ; 0, Oesophagus; L, Lung bud; PB-, Buccalportion of hypophysis cerebri; SP, Sessels pouch. wiU involve the soft tissues alone, or in additionthe bone, according to the extent of or excessive union between the maxil-lary and mandibidar processes produces theconditions known as macro- and micro-stomarespectively. A median cleft of the upper orlower lip may occur, and may or may notinvolve the subjacent bone according to theextent of non-union. Clefts of the upper orlower lip in the median line are rare deformities,more especially the latter. A median cleft ofthe upper lip would arise through non-unionof the globular or lateral tubercles on the naso-. cu Fig. 9.—-Vertical section through the head of a ratembryo (from Cunningham). Ectoderm is repre-sented in black, mesoderm stippled, and entodermstriated. T, Tongue; H, Heart; N, Nasal Cavity; CH, Cerebralhemisphere; TH, Thalamenccphalon; P, Pinealbody; MB, Mid-brain; HB, Hind-brain; PBSCerebral part of hypophysis cerebri; PB-, Buccalpart of hypophysis cerebri; AT, Atlas; EP, Epi-stropheus; SG, Spinal ganglion; BCA, Basi-cranialaxis; FG, Fore-gut; A, Amnion; BP, Bucco-pharyngeal membrane; NF, Naso-frontal process;MD, Mandibular process; S, Stomatodaeum. developing into the future lip, while tlie innerand smaller forms the gum (see Fig. 13).Incomplete separation of the oral margin of theprimitive jaw to form the lips and gums givesrise to the condition known as atresia of thelips and gums, a rare malformation except inits slight forms, in which it occurs in associationwith a complete hare-lip. A thick fraenumlabii is a less marked degree
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
