entodermic

The protoplasm of the ectodermic (outer) cells is clearer and firmer than the thicker and softer cell-matter of the entodermic

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

At first the chorda only consists of a single row of large entodermic cells.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

It is the same with the vessels of the germinative area (Figure 2.361 v), which lie on the entodermic membrane of the yelk-sac (c).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The less clear entodermic cells (i) are distinguished at first by their rounder shape and darker nuclei from the higher, clearer, and longer entodermic cells (e), afterwards both are greatly flattened, the inner blastodermic cells more than the outer.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

In consequence of these important folding-processes in the primitive gut, the simple entodermic tube divides into four different sections: --

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

(Figure 1.73 A) leads to the formation of an eccentric cavity, the group of the darker entodermic cells (hy) remaining directly attached at one spot with the round enveloping stratum of the lighter ectodermic cells (ep).

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

The central primitive gut-cavity (d) is full of entodermic cells.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

According to him, there are first formed on the bilateral gastrula we have already considered (Figures 1.36 and 1.37) three parallel longitudinal folds -- one single ectodermal fold in the central line of the dorsal surface, and a pair of entodermic folds at the two sides of the former.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876

The false bladder of the fishes is a mesodermic product of the nephroducts; the true bladder of the Dipneusts, Amphibia, and Amniotes is an entodermic blind sac of the rectum.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Its globular blastula (Figure 1.45) consists of loosely-aggregated, yelk-filled entodermic cells or yelk-cells (dz) in the lower vegetal half; the upper, animal half encloses the hemispherical segmentation-cavity (fh), the curved roof of which is formed of two or three strata of small ectodermic cells.

The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876