animal pole


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an·i·mal pole

the point in a telolecithal oocyte (egg) opposite the yolk, where most of the protoplasm is concentrated and where the nucleus is located; from this region, the polar bodies are extruded during maturation.
Synonym(s): germinal pole

animal pole

n. Embryology
The portion of an egg that is opposite the vegetal pole, that contains the nucleus and most of the cytoplasm, and from which polar bodies are extruded during maturation.

animal pole

Etymology: L, anima
the active, formative part of an ovum. It contains the nucleus and the bulk of the cytoplasm and is the site where the polar bodies form. In mammals, the animal pole is also the site where the inner cell mass develops and gives rise to germ layers. Also called germinal pole. Compare vegetal pole.

an·i·mal pole

(an'i-măl pōl)
The point in a telolecithal egg opposite the yolk, it is the site of the nucleus and most of the protoplasm; from this region, polar bodies are extruded during maturation.
Synonym(s): germinal pole.
Animal poleclick for a larger image
Fig. 36 Animal pole . The animal pole in a generalized ovum.

animal pole

the point on the surface of an animal ovum nearest to the nucleus and normally at the opposite side of the egg from the aggregation of yolk droplets at the VEGETAL POLE.
References in periodicals archive ?
One or 2 hr later, the darkened cells of chlorpyrifos-exposed larvae began to show extrusion from the animal pole (extrusion, not proliferation--see below).
As a result of chlorpyrifos treatment in this sensitive period, a compact extralarval cap, largely comprised of pigmented cells, formed at the animal pole, and the blastocele, indeed the larva itself, was correspondingly diminished because of both cell extrusion and compaction.
Before its loss, the cap was connected to the animal pole of the larva by a thin stalk.