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Related to spermatozoon: spermatozoa


 [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.


, pl.


The male gamete or sex cell that contains the genetic information to be transmitted by the male, exhibits autokinesia, and is able to effect zygosis with an oocyte. The human sperm is composed of a head and a tail, the tail being divisible into a neck, a middle piece, a principal piece, and an end piece; the head, 4-6 mcm in length, is a broadly oval, flattened body containing the nucleus; the tail is about 55 mcm in length.
Synonym(s): sperm cell, spermatozoon
[G. sperma, seed]
Farlex Partner Medical Dictionary © Farlex 2012


(spər-măt′ə-zō′ŏn′, -ən, spûr′mə-tə-)
n. pl. spermato·zoa (-zō′ə)
The mature male gamete of an animal, usually consisting of a nucleate head, a short neck, and a thin motile tail.

sper·mat′o·zo′al (-zō′əl), sper·mat′o·zo′an (-zō′ən)(-zō′ĭk), sper·mat′o·zo′ic (-zō′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


The male gamete or sex cell that contains the genetic information to be transmitted by the male, exhibits autokinesia, and is able to effect zygosis with an oocyte. The human sperm is composed of a head and a tail, the tail being divisible into a neck, a middle piece, a principal piece, and an end piece; the head, 4-6 mcm in length, is a broadly oval, flattened body containing the nucleus; the tail is about 55 mcm in length.
[G. sperma, seed]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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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


see SPERM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Patient discussion about spermatozoon

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.

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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

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References in periodicals archive ?
Immunolocalization studies in the seabream have confirmed that, as in the testis, multiple aquaporins are present in the spermatozoon (Table 1).
Fertilization can be divided into five major steps: 1) passage of the sperm through the cumulus oophorus (in species where this structure is present at the time of fertilization), 2) binding between the spermatozoon and oocyte, 3) induction of the spermatozoon's acrosome reaction, 4) fusion of the spermatozoon and oocyte, and 5) activation of the oocyte.
When performing either the basic or the complete differential, 200 spermatozoa are evaluated and each spermatozoon is identified as either normal or abnormal.
The occurrence of similar ridges in spermatozoon tails has been demonstrated in various teleost fishes such as rainbow trout Salmo gairdneri (Billard, 1983).
The selected fertilising spermatozoon will be morphologically normal and highly motile, and is supposed to have an intact DNA.
The anterior head of the mature spermatozoon is covered by an acrosomal membrane, which was derived from the spermatid's Golgi apparatus during spermiogenesis.
A recent meta-analysis suggested that, compared with overnight coincubation, a short period of spermatozoon and oocyte coincubation provides more satisfactory IVF outcomes [21].
To understand the basic mechanisms underlying flagellar movement and sperm function, it is necessary to quantitatively estimate the hydrodynamic characteristics--for example, the flagellar force generated by a flagellum, the power output dissipated by a flagellum, and the bending moment acting on a flagellum, as well as the swimming speed of a spermatozoon (Gray and Hancock, 1955; Brokaw, 1970; Hiramoto and Baba, 1978; Baltz et al., 1988; Ishijima and Hiramoto, 1994; Ishijima, 2011).
In sea urchins, species specific adhesion of spermatozoa to the vitelline envelope is effected by a protein termed bindin exposed during spermatozoon acrosoma reaction, which recognizes a 350 kDa glycopeptide on the oocyte envelope (Monroy & Rosati, 1983; Wassarman, 1987; Correa & Carroll, 1997; Hirohashi & Lennarz, 2001).
When (ICSI) is used, this natural selection barrier is bypassed and a spermatozoon with damaged DNA is directly injected into the oocyte (6,44).