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Female fish, for example, spawn ova into their aquatic environment, where they are fertilized by the semen of the male fish.During internal fertilization, however, fertilization occurs inside the female's sexual organs.
In most vertebrates, including amphibians, reptiles, birds and monotreme mammals, copulation is achieved through the physical mating of the cloaca of the male and female.Semen, also known as seminal fluid, is an organic fluid that may contain spermatozoa.It is secreted by the gonads (sexual glands) and other sexual organs of male or hermaphroditic animals and can fertilize female ova.In humans, seminal fluid contains several components besides spermatozoa: proteolytic and other enzymes as well as fructose are elements of seminal fluid which promote the survival of spermatozoa, and provide a medium through which they can move or "swim".Semen is produced and originates from the seminal vesicle, which is located in the pelvis.The process that results in the discharge of semen is called ejaculation. In animals, semen has been collected for cryoconservation.
Cryoconservation of animal genetic resources is a practice that calls for the collection of genetic material in efforts for conservation of a particular breed.
Depending on the species, spermatozoa can fertilize ova externally or internally.
In external fertilization, the spermatozoa fertilize the ova directly, outside of the female's sexual organs.
In marsupial and placental mammals, copulation occurs through the vagina.
During the process of ejaculation, sperm passes through the ejaculatory ducts and mixes with fluids from the seminal vesicles, the prostate, and the bulbourethral glands to form the semen.
The seminal vesicles produce a yellowish viscous fluid rich in fructose and other substances that makes up about 70% of human semen.