Word Finder - invaginated

definition

To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure.

definition

To turn or fold inwardly.

definition

To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula.

The invaginated cells (derived from the division of the four big cells) form the endoderm or arch-enteron; the outer cells are the ectoderm.

The other extreme end closes, but the invaginated endoderm cells remain in continuity with this extremity of the blastopore, and form the " rectal peduncle " or " pedicle of invagination " of Lankester, although the endoderm cells retain no contact with the middle region of the now closed-up blastopore.

The body-cavity and the muscular, fibrous and vascular tissues are traced partly to two symmetrically disposed " mesoblasts," which bud off from the invaginated arch-enteron, partly to cells derived from the ectoderm, which at a very early stage is connected by long processes with the invaginated endoderm.

The mass of the arch-enteron or invaginated endodermal sac has taken on a bilobed form, and its cells are swollen (gs and tge).

To the right (in the figure) of the rectal peduncle is seen the deeply invaginated shell-gland ss, with a secretion sh protruding from it.

Kowalevsky or a bug is invaginated into the yolk at the head end, the portion of (1871 and 1887) on the embryology of the water-beetle Hydrophilus the blastoderm necessarily pushed in with it forming the amnion.

Lecaillon (1898) on various leaf beetles, tend to show that the organ " in the embryos of the lower Arthropoda corresponds with whole of the " mid-gut " arises from the proliferation of cells at the the region invaginated to form the serosa of the hexapod embryo.

B, A section through the same; a, the invaginated proboscis; b, proboscis sheath; c, beginning of the neck; d, lemniscus.

C, invaginated head of Cysticercus cellulosae, showing the bent neck and receptacle r; X 30.

By a process of infolding, the thicker end is partially invaginated, the middle portion or " hind-body " and the organism may now present a superficial likeness to a cercaria.

In most other cases the tail is not distinguishable, and the body of the larva is separable only into a scolex invaginated with a bladder (= hind-body and tail).

In accordance with this we can regard the development as an adaptive one and the scolex as invaginated for protective FIG.

The tion of liquid between the gonads themselves are extremely outer and the invaginated simple arborescent glands which cells.

The invaginated layer is the enteric cell-layer or endoderm; the outer cell-layer is the dermic cell-layer or ectoderm.

The shell-gland, as development proceeds, extends from its point of origin as an ectodermic thickening, which may be only slightly concave or may be deeply invaginated and then evaginated.

Then follows the phenomenon of gastrulation, by which onehalf of the blastula is invaginated into the other, so as to obliterate the segmentation cavity.

One large cell, or megamere, remains for some time unsegmented but is finally segmented and forms the endoderm cells which are invaginated.

B, portion of the bladder (hind-body and tail), showing the invaginated portion (scolex) and traces of the excretory system.