Zoological terms

Zoological terms

Terms in relation to animals, such as mammals, birds, reptiles or fish.

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Zoological terms

flagellum

Zoology; Zoological terms

(pl. flagella) Long whiplike organelle protruding from the surface of the cell that either propels the cell acting as a locomotory device, or moves fluids past the cell, becoming a feeding apparatus

gamete

Zoology; Zoological terms

(Gk. gamos, wife) A specialized sex cell such as an ovum (egg) or a sperm; is haploid. A male (sperm) and a female gamete (ovum) fuse and give rise to a diploid zygote, which develops into a new ...

ganglion

Zoology; Zoological terms

A distinct clump of nerve cells that acts like a primitive brain, found in the head region of many invertebrates, an aggregation of nerve cell bodies located outside the central nervous system

gastrula

Zoology; Zoological terms

The blastula is transformed into a gastrula by cell movements known as gastrulation

gastrulation

Zoology; Zoological terms

(“gut formation“) Movement of embryonic cells generates three cell layers - the ecto -, meso -, and endoderm - each layer in turn giving rise to specific body organs and tissue.

invagination

Zoology; Zoological terms

The vegetal hemisphere of the blastula grows inwards forming a pouchlike space, it opens to the exterior through the blastopore

epiboly (in theolecithal ova)

Zoology; Zoological terms

The large amount of yolk in the vegetal hemisphere makes inward growth of the blastomeres difficult; epiboly results in a gastrula with a blastopore at the vegetal pole and with a vestige of ...