The normal environment of the vagina is a hostile one (c.f. The seminal plasma provides a nutritive and protective medium for the spermatozoa during their journey through the female reproductive tract. Seminal plasma of humans contains a complex range of organic and inorganic constituents. The accessory genital ducts, the seminal vesicle, prostate glands, and the bulbourethral glands, produce most of the seminal fluid.
Once the semen enters the ductus epididymis the principal cells, which contain pinocytotic vessels indicating fluid reabsorption, secrete glycerophosphocholine which most likely inhibits premature capacitation. The ductuli efferentes possess cuboidal cells with microvilli and lysosomal granules that modify the ductal fluid by reabsorbing some fluid. Sertoli cells, which nurture and support developing spermatocytes, secrete a fluid into seminiferous tubules that helps transport sperm to the genital ducts. The bulbourethral glands secrete a clear secretion into the lumen of the urethra to lubricate it. The prostatic secretion, influenced by dihydrotestosterone, is a whitish (sometimes clear), thin fluid containing proteolytic enzymes, citric acid, acid phosphatase and lipids. The seminal vesicles produce a yellowish viscous fluid rich in fructose and other substances that makes up about 70% of human semen. Human Compositionĭuring 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. In marsupial and placental mammals, copulation occurs through the vagina. 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. Internal fertilization takes place after insemination of a female by a male through copulation. Female fish, for example, spawn ova into their aquatic environment, where they are fertilized by the semen of the male fish.ĭuring internal fertilization, however, fertilization occurs inside the female's sexual organs. In external fertilization, the spermatozoa fertilize the ova directly, outside of the female's sexual organs. Cryoconservation of animal genetic resources is a practice that calls for the collection of genetic material in efforts for conservation of a particular breed.ĭepending on the species, spermatozoa can fertilize ova externally or internally. In animals, semen has been collected for cryoconservation. Semen is also a form of genetic material. The fluid is designed to be discharged deep into the vagina, so the spermatozoa can pass into the uterus and form a zygote with an egg. 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". The process that results in the discharge of semen from the urethral orifice is called ejaculation. Semen is produced and originates from the seminal vesicle, which is located in the pelvis. It is secreted by the gonads (sexual glands) and other sexual organs of male or hermaphroditic animals and can fertilize the female ovum.
Semen, also known as seminal fluid, is an organic bodily fluid created to contain spermatozoa. When using a search engine such as Google, Bing or Yahoo check the safe search settings where you can exclude adult content sites from your search results Īsk your internet service provider if they offer additional filters īe responsible, know what your children are doing online.Spermatozoa, in this case human, are a primary component in normal semen, and the agents of fertilization of female ova. Use family filters of your operating systems and/or browsers Other steps you can take to protect your children are: More information about the RTA Label and compatible services can be found here. Parental tools that are compatible with the RTA label will block access to this site. We use the "Restricted To Adults" (RTA) website label to better enable parental filtering. Protect your children from adult content and block access to this site by using parental controls. PARENTS, PLEASE BE ADVISED: If you are a parent, it is your responsibility to keep any age-restricted content from being displayed to your children or wards. Furthermore, you represent and warrant that you will not allow any minor access to this site or services. This website should only be accessed if you are at least 18 years old or of legal age to view such material in your local jurisdiction, whichever is greater. You are about to enter a website that contains explicit material (pornography).