A normal spermatozoon was defined as one with morphometric parameters within normal levels.

However, freezing and thawing reduces spermatozoon motility, viability, and fertilizing ability.

The spermatozoon penetrates into the ovule and becomes fused with it.

This vital stimulus can be imparted only by the spermatozoon.

The fertilisation of the ovum by the spermatozoon (of a mammal).

In the previous illustrations we have distinguished in the spermatozoon a head, trunk, and tail.

But what is sex but the difference between ovum and spermatozoon, between megagamete and microgamete?

Ordinarily, the ovum incorporates the form of the foetus compressed within the spermatozoon that fertilizes it.

Only in an insensate manner, like a spermatozoon.

These almost infinitely numerous and minute gemmules are contained within each bud, ovule, spermatozoon, and pollen-grain.

First touching the action of the spermatozoon.

He experimented with frogs, tortoises, and dogs; and settled beyond question the function of the ovum and spermatozoon.

The germ acts on the cell, as Lancereaux has pointed out, in the same way as a spermatozoon.

And when such a spermatozoon reached an ovum, the name would induce the creation of a new foetus.

These marked differences suggest that dysfunctional spermatozoon after cryopreservation may be due to protein degradation and protein phosphorylation.

It had long been known that all higher forms start in life as single cells, egg and spermatozoon.