. The development of the chick; an introduction to embryology . he fore-gut and neural tube and endsanteriorly in a mass of mesenchyme lying between the infundib-iflum and fore-gut. The Nervous System. The neural tuloe is closed at the 12 s Fig. 68. — A. Transverse section across the axis of the embryo and the en-tire blastoderm of one side. The section i)asses throvifih the sixth somiteof a 10 s embryo, and is intended to show the topography of the regions B, C, D, E are rejjresentcd under higlier magnification in theFigs. B, C, D, V. e., Area viteUina externa, a. v. A
. The development of the chick; an introduction to embryology . he fore-gut and neural tube and endsanteriorly in a mass of mesenchyme lying between the infundib-iflum and fore-gut. The Nervous System. The neural tuloe is closed at the 12 s Fig. 68. — A. Transverse section across the axis of the embryo and the en-tire blastoderm of one side. The section i)asses throvifih the sixth somiteof a 10 s embryo, and is intended to show the topography of the regions B, C, D, E are rejjresentcd under higlier magnification in theFigs. B, C, D, V. e., Area viteUina externa, a. v. Area viteUina interna. Bl. Bloodisland. Bl. v., Blood vessel. Coel., Cdlome. (i. W., Germ-wall. M. O.,Margin of overgrowth. Nph., Nephrotome. 8., Somite. Sompl. Soma-topleiire. Si)r])l-,^pl:u»hiiopl(^ii<3- 8om. Mes., Somatic layer of Mes., splanchnic layer of the S. T., Siiuis terminalis. Y. , entoderm. Z. J., Zone of junction. B C area D nfe//ma /nferna ^^^^ I E f orea fie//ucK/a \ area voscu/oso \ r Somp. \ 3// ■■■^(■■1 ■^^■w^ ^lp^^l,^ ^\^. CiiS D
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