Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to spermatozoa: azoospermia


 [sper″mah-to-zo´on] (pl. spermatozo´a) (Gr.)
a mature male germ cell, the specific output of the testes, which fertilizes the mature ovum (secondary oocyte) in sexual reproduction. It is microscopic in size, looks like a translucent tadpole, and has a flat elliptical head containing a spherical center section, and a long tail by which it propels itself with a vigorous lashing movement. Spermatozoa are produced in the seminiferous tubules of the testes. The developmental stages of the germ cell are the spermatogonium, spermatocyte, spermatid, and finally spermatozoon. When mature, the spermatozoa are carried in the semen. At the climax of coitus, the semen is discharged into the vagina of the female. A single discharge (about a teaspoonful of semen on the average) may contain more than 250 million spermatozoa. Only a few of these will travel as far as the fallopian tubes; if an ovum is present there, and if the head of a single sperm penetrates the ovum, fertilization takes place. adj., adj spermatozo´al.
Human spermatozoon: side view (in cross-section) and flat view.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Plural of spermatozoon.
Farlex Partner Medical Dictionary © Farlex 2012
Enlarge picture
SPERMATOZOON: Mature sperm cell


(sper?mat-o-zo'on) plural.spermatozoa [? + zoon, life]
The mature male sex or germ cell formed within the seminiferous tubules of the testes. The spermatozoon has a broad oval flattened head with a nucleus and a protoplasmic neck or middle piece and tail. It is about 51µm long and resembles a tadpole. It has the power of self-propulsion by means of a flagellum. It develops after puberty from the spermatids in the testes in enormous quantities. The head pierces the envelope of the ovum and loses its tail when the two cells fuse. This process is called fertilization.
See: illustration; sperm for illus.; fertilization
Medical Dictionary, © 2009 Farlex and Partners


Microscopic cells about 0.05 mm long occurring in millions in seminal fluid. Spermatozoa are male GAMETES, carrying all the genetic contribution from the father and bearing either an X chromosome to produce a daughter, or a Y chromosome to produce a son.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Sperm or spermatozoa

The part of the semen that is generative—can cause fertilization of the female ovum.
Mentioned in: Condom
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about spermatozoa

Q. how do i teat my no sperm count? i do not have a live sperm,how can i treat and have live sperm count

A. The treatment is done only at specialist centers, and consists first of evaluation of the reason for this condition (called azoospermia). If an anatomical malformation is found, it may be corrected, as well as medical conditions, and in some cases, direct extraction of sperms from the testes (called MESA) enables in-vitro fertilization.

You may read more here:

Q. What are some ways to get an erection? Libido and sperm are OK. I have had a problem with depression for years. I have always had a strong libido and I find that my ED has been a factor in my depression. Sexual relationships have helped me deal with my depression. What a MIRACLE! How can something so good be a remedy for mental problems. Oh! for a good stiff dick. I have considered a penile prosthesis implant but I'm still hoping for something better. Any information that might help would be greatly appreciated and I will remember you in my dreams and fantasies(sexual)for you ladies and I'll thank you studs. John

A. I am a female but my husband likes to think about a womans vagina. So maybe you should get a fake vagina try Adameve.com. And also try lubricants and other things, think about what turns you on.

Q. can hepatitis be transferred from fathers sperm when concieving a child? My partner has hepatitis C and he has gotten me pregnant will our baby have it too?

A. Here is taken from wikipedia (http://en.wikipedia.org/wiki/Hepatitis_C#Transmission) :

Sexual transmission of HCV is considered to be rare. Studies show the risk of sexual transmission in heterosexual, monogamous relationships is extremely rare or even null. The CDC does not recommend the use of condoms between long-term monogamous discordant couples (where one partner is positive and the other is negative). However, because of the high prevalence of hepatitis C, this small risk may translate into a non-trivial number of cases transmitted by sexual routes. Vaginal penetrative sex is believed to have a lower risk of transmission than sexual practices that involve higher levels of trauma to anogenital mucosa.

Mother-to-child transmission of hepatitis C has been well described, but occurs relatively infrequently. Transmission occurs only among women who are HCV RNA positive at the time of delivery; the risk of transmission in this setting is approximately 6 out of 100. Among women w

More discussions about spermatozoa
This content is provided by iMedix and is subject to iMedix Terms. The Questions and Answers are not endorsed or recommended and are made available by patients, not doctors.
References in periodicals archive ?
In vitro fertilization (IVF) requires the highest amount of live spermatozoa, although low concentrations are used to perform oocyte fertilization (Mizushima et al., 2014).
These are especially due to a destabilization in the antioxidant system of spermatozoa. This system preserves sperm cells from oxidative stress, which affects their survival and fertilizing ability.
The expression of cysteinerich secretory protein 2 (CRISP2) and its specific regulator miR-27b in the spermatozoa of patients with asthenozoospermia.
The reservoir is important for the maintenance of the spermatozoa, isolating them from the external environment, and preventing contact with the hemolymph molecules (Pascini & Martins 2017).
Motility of the spermatozoa used for freezing in most of the A.I organization is above 60 percent (Kaka et al., 2016).
Spermatozoa degerlendirilmesi icin calismaya davet edilme kriterleri, yardimla ureme tekniklerinin uygulanacagi gun yapilan spermiyogram analizinde, Dunya Saglik Orgutu'nun 2010 kriterlerine (18) gore normozoospermi, oligozoospermi, teratozoospermi veya astenozoospermi gozlenen ornege sahip erkek bireyin olmasi ve tanisi koyulan herhangi bir kadin faktorunun olmadigi durumdur.
In the efferent duct (proximal), there were few spermatozoa (Figure 3D).
According to initial concentration, a spermatozoa aliquot in 2mL poly-propylene microtubes (Eppendorf, Hamburg, Germany) was then diluted in 500[micro]L of CM or SP to reach the final concentration of 400 x 106 sperm per mL.
Spermatozoa number: Fresh storage organs were immersed in saline solution ([NaCl.sub.2] 0.9 gm/ 100 ml distilled water) and cut to liberate sperm packages.
Spermatozoa of pearl oysters ([10.sup.4] [mL.sup.-1]) were exposed to the whole culture of each harmful alga, collected at early stationary growth phase (SG), in 6-well plates (5 mL per well).
The presence of leptin receptors on the tail of spermatozoa suggests an effect on motility [25] as described in Section 1.1.2 of this review.