The entodermic membrane is only interrupted at one spot, one, two, or three of the ectodermic cells being loose there.
A section through the embryo in the hatched hen's egg towards the close of the first day of incubation shows in the middle of the dorsal surface a broad ectodermic medullary groove (Figure 1.
They are originally single cells of ectodermic origin which sink below the epidermis and become connected with radiating muscular fibres.
At the sides of the optic ganglia a pair of ectodermic invaginations are formed, which in the adult become the white bodies of the eyes, surrounding the optic ganglion.
The nephridia, in fact, on this view, are ectodermic ingrowths, the coelomoducts coelomic outgrowths.
Langerhans, with a pair of lateral fins on the tail and a thickened ectodermic ridge running back on each side from the head to the anterior end of the fin.
The network is, however, of the duct of the nephridium, possibly ectodermic in origin, and does not affect the glandular tubes which remain undivided and with one coelomic funnel each.
With very few exceptions a calcareous skeleton is present in all Alcyonaria; it usually consists of spicules of carbonate of lime, each spicule being formed within an ectodermic cell (fig.
The preponderating elements of theectodermic layer are elongated columnar cells, each containing a nucleus, and bearing cilia at their free extremities.
The cells forming the limbs of the ectodermic folds secrete nodules of calcite, and these, fusing together, give rise to six (or twelve) vertical radial plates or septa.
The outer skin or epidermis, consists of simple ectodermic cells, and contains no blood-vessels (Figure 2.
When we come to the higher Metazoa, in which the sensory functions and their organs are more advanced, we find a division of labour among the ectodermic cells.
The acoustic nerve is formed from ectodermic cells of the hind brain, and develops from the nervous structure that appears at its dorsal limit.
Their skin is merely a layer of ciliated ectodermic cells.
The part of the cloaca from the upper wall of which it forms belongs to the proctodaeum, the ectodermic invagination of the rectum (Chapter 2.
The placenta is formed by the branches of the blood-vessels in the wall of the allantois growing into the hollow ectodermictufts (villi) of the chorion, which run into corresponding depressions in the mucous membrane of the womb.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ectodermic" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: cutaneous; dermal; epidermal; furry; hypodermic; skinny; subcutaneous
