Sperm (pl.: sperm or sperms) is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger,...

extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia. The sperm whale is a pelagic mammal...

is also referred to as ejaculate analysis, human sperm assay (HSA), sperm function test, and sperm assay.[citation needed] Semen analysis is a complex...

Sperm donation is the provision by a man of his sperm with the intention that it be used in the artificial insemination or other "fertility treatment"...

leaves the male body the sperm's survival likelihood is reduced and it may die, thereby decreasing the total sperm quality. Sperm cells come in two types...

Female sperm can refer to either: A sperm which contains an X chromosome, produced in the usual way in the testicles, referring to the occurrence of such...

in females that stores sperm for later use, the sperm sac. Milt, sperm sacs, large sacs containing large amounts of matured sperm. Epididymis, a part of...

A sperm granuloma is a lump of leaked sperm that appears along the vasa deferentia or epididymides in vasectomized individuals. While the majority of...

Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction....

competition Sperm donation Sperm granuloma Sperm guidance Sperm heteromorphism Sperm motility Sperm precedence Sperm sorting Sperm theft Sperm washing Catch...

Livyatan is an extinct genus of macroraptorial sperm whale containing one known species: L. melvillei. The genus name was inspired by the biblical sea...

Artificial insemination is the deliberate introduction of sperm into a female's cervix or uterine cavity for the purpose of achieving a pregnancy through...

Sperm oil is a waxy liquid obtained from sperm whales. It is a clear, yellowish liquid with a very faint odor. Sperm oil has a different composition from...

Sperm precedence, also known as sperm predominance, is tendency of a female who has been bred by multiple males to give birth to their offspring in unequal...

three extant species of whales: the sperm whale, in the genus Physeter, and the pygmy sperm whale and dwarf sperm whale, in the genus Kogia. In the past...

a sexual partner. Sperm sold by a sperm donor is known as donor sperm. A sperm bank may be a separate entity supplying donor sperm to individuals or to...

result in pregnancy. "Sperm theft" (also known as "unauthorized use of sperm", "spermjacking" or "spurgling" (a portmanteau of sperm and burgling)), refers...

Sperm Wars is a popular science book by evolutionary biologist Robin Baker about sperm competition. Originally published in English in 1996, it has since...

species, males allocate sperm differently due to the Coolidge effect. The allocation is usually according to level of sperm competition, female novelty...

established the need of interaction between the female's ovum and male's sperm to form a zygote in frogs. In 1827, Karl Ernst von Baer observed a therian...

complement. Sperm heteromorphism is also called sperm polymorphism or sperm dimorphism (for species with two sperm types). Typically, only one sperm type is...

Sperm washing is the process in which individual sperms are separated from the semen. Washed sperm is used in artificial insemination using the intrauterine...

The dwarf sperm whale (Kogia sima) is a sperm whale that inhabits temperate and tropical oceans worldwide, in particular continental shelves and slopes...

fertility, a measure of the ability of sperm in semen to accomplish fertilization. Semen quality involves both sperm quantity and quality. Semen quality...

Sperm donation laws vary by country. Most countries have laws to cover sperm donations which, for example, place limits on how many children a sperm donor...

Human fertilization is the union of an egg and sperm, occurring primarily in the ampulla of the fallopian tube. The result of this union leads to the...

Sperm competition is a form of post-copulatory sexual selection whereby male sperm simultaneously physically compete to fertilize a single ovum. Sperm...

deferentes), or sperm duct is part of the male reproductive system of many vertebrates. The vasa deferentia are paired sex organs that transport sperm from the...

Sperm sorting is a means of choosing what type of sperm cell is to fertilize the egg cell. Several conventional techniques of centrifugation or swim-up...

only one individual transferring sperm to the other, or the pair can transfer sperm bilaterally. Both forms of sperm transfer can occur in the same species...