Noun:

புறப்படலம், புறப்படை,

ectoderm தமிழ் அர்த்தத்தின் உதாரணம்:

வளர்ச்சியுற்ற நிலையில் புறப்படலம் தோல், நரம்புத் தொகுதியையும், இடைப்படலம் தசை, எலும்புத் தொகுதியையும், அகப்படலம் சமிபாடு, சுவாசத் தொகுதி போன்றவற்றையும் உருவாக்க வல்லன.

இவை புறப்படலம் (ectoderm), இடைப்படலம் (mesoderm), அகப்படலம் (endoderm) எனப்படும்.

ectoderm's Usage Examples:

In the vast majority of winged insects the terminal part of the genital system (vagina and ductus ejaculatorius) is unpaired and ectodermal.

Between the ectoderm and endoderm a gelatinous supporting layer, termed the mesogloea, makes its appearance.

c, Cordylus, composed of flattened ectoderm ec covering a large-celled endodermal axis en.

The ectoderm loses entirely the ciliation which it had in the planula and actinula stages and commonly secretes on its external surface a protective or supporting investment, the perisarc.

There is, however, no evidence whatever for this, the gonads of Hydra being purely ectodermal structures, while all medusoid gono phores have an endodermal portion.

There is some evidence that in this group the ectoderm of the oesophagus is chiefly concerned with digestion, whereas the endoderm of the intestine is limited to the absorption of the soluble products.

In the Hydromedusae they usually, if not invariably, ripen in the ectoderm, but in the neighbourhood of the main sources of nutriment, that is to say, not far from the stomach.

This name is applied to the numerous fine caecal tubes of noticeable length developed from the proctodaeal invert of ectodermal origin in Hexapods.

The order Coenothecalia is represented by a single living species, Heliopora coerulea, which differs from all recent Alcyonaria in the fact that its skeleton is not composed of spicules, but is formed as a secretion from a layer of cells called calicoblasts, which originate from the ectoderm.

Into these fins, which are largely cuticular and strengthened by radiating bars, a single layer of ectoderm cells projects.

It is evident that the outer envelope of the gonophore represents the ex-umbral ectoderm (ex.

- Portion;of the body-wall of Hydra, showing ectoderm cells above, separated by " structureless lamella " from three flagellate endoderm cells below.