The American journal of anatomy . plate and the ectoderm. Theposterior one is a broad depression which corresponds to the futuremouth opening. The entoderm surrounding the anterior pit isthe preoral entoderm and corresponds in every way to the preoralentoderm of most selachians (cf. Johnston, 1909). 4G J. B. Johnston. the neural plate rolls np into a tube (Fig. 2) pressure isexerted upon the archenteron by the brain portion of the neuraltube and the effed is seen in a compression of the archenteric two angles seen in sagittal sections are now more marked andare separated by a
The American journal of anatomy . plate and the ectoderm. Theposterior one is a broad depression which corresponds to the futuremouth opening. The entoderm surrounding the anterior pit isthe preoral entoderm and corresponds in every way to the preoralentoderm of most selachians (cf. Johnston, 1909). 4G J. B. Johnston. the neural plate rolls np into a tube (Fig. 2) pressure isexerted upon the archenteron by the brain portion of the neuraltube and the effed is seen in a compression of the archenteric two angles seen in sagittal sections are now more marked andare separated by a thickening or fold of the intervening the meantime the notochord and mesoderm are forming in thesame manner as in selachians. In the stages represented in Figs. 2and 3 the notochord ends anteriorly in a median mass which is notseparated from the entoderm and is continuous laterally with themesoderm which is in process of splitting off from the median mass remains in continuity with the preoral
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1910
