. The development of the chick; an introduction to embryology . origin, and appear to have a more intimate connection withthe myotome. In the more anterior and older somites, twentyand seventeen (Figs. 109 and 110), the process has progressedmuch farther and the neural crest cells are completely expelledfrom the neural tube, which closes after them (Fig. 110). A j-etlater stage is shown in Fig. Ill, through the twenty-third somiteof a 35 s embryo. The dorsal commissure uniting the right and left sides of thecrest ruptures, and the cells of the crest aggregate so as to forma pair of ganglia in
. The development of the chick; an introduction to embryology . origin, and appear to have a more intimate connection withthe myotome. In the more anterior and older somites, twentyand seventeen (Figs. 109 and 110), the process has progressedmuch farther and the neural crest cells are completely expelledfrom the neural tube, which closes after them (Fig. 110). A j-etlater stage is shown in Fig. Ill, through the twenty-third somiteof a 35 s embryo. The dorsal commissure uniting the right and left sides of thecrest ruptures, and the cells of the crest aggregate so as to forma pair of ganglia in each somite. Thus, although the neural crestis primarily a median structure, it becomes divided into twolateral halves, and although it is primarily a continuous structureit becomes divided into a series of pairs of metameric fate of the interganglionic commissures is conjectural. Theganglia are ill-defined from the mesenchyme when they are first FROM TWELVE TO THIRTY-SIX SOMITES 163 V. Md. ■^•^-l Ot. i^~ ^ h ;-,_!^ ——•^-^^^SsSt-- ■■--■ ^.27 ■—i/?//:
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Keywords: ., bookauthorlilliefrankrattray187, bookcentury1900, bookdecade1910
