gonad


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gonad

 [go´nad]
a gamete-producing gland; the ovary in the female or the testis in the male. Called also sex gland. adj., adj gonad´al, gonad´ial. The ovary produces the oocyte (ovum) and the testis produces the spermatozoon. In addition, the gonads secrete hormones that influence the development of the reproductive organs at puberty, and they control other physical traits that differentiate men from women (secondary sex characters), such as pitch of the voice and body form and size. The hormones produced by the ovary include estrogen and progesterone. The principal hormone produced by the testis is testosterone.

go·nad

(gō'nad),
An organ that produces sex cells; a testis or an ovary.
[Mod. L. fr. G. gonē, seed]

gonad

/go·nad/ (go´nad) a gamete-producing gland; an ovary or testis.gonad´algonad´ial
indifferent gonad  the sexually undifferentiated gonad of the early embryo.
streak gonads  undeveloped gonadal structures in the broad ligament below the fallopian tube, composed of whorled connective-tissue stroma without germinal or secretory cells; seen most often in Turner's syndrome.

gonad

(gō′năd′)
n.
An organ in animals that produces gametes, especially a testis or ovary.

go·nad′al (gō-năd′l), go·nad′ic adj.

gonad

[gō′nad]
Etymology: Gk, gone, seed
a gamete-producing gland, such as an ovary or a testis. gonadal, adj.

gonad

A sex organ: testis in males; ovary in females.

go·nad

(gō'nad)
An organ that produces sex cells; a testis or an ovary.
[Mod. L. fr. G. gonē, seed]

gonad

the OVARY or TESTIS of an organism.

gonad

organ that produces the gametes (germ cells): ovary and testis.

gonad

ovary or testis

go·nad

(gō'nad)
An organ that produces sex cells; a testis or an ovary.
[Mod. L. fr. G. gonē, seed]

gonad (gō´nad),

n an ovary or testis, the site of origin of eggs or spermatozoa.

gonad

a sex gland; a gamete-producing gland; the ovary in the female and the testis in the male.
The ovary produces the ovum and the testis produces the spermatozoon. In addition, the gonads secrete hormones that influence the development of the reproductive organs and the physical traits that differentiate males from females, such as a crest and body form and size (the secondary sex characters). The hormones produced by the ovary include estrogen and progesterone. The principal hormone produced by the testis is testosterone.

hermaphroditic g's
these gonads vary widely between combinations of male and female tissues in an ovotestis, of which there may be one or two, to a testicle on one side and an ovary on the other.
indifferent gonad
the primordial stage of the embryonal gonad, before differentiation into a male or female organ.
References in periodicals archive ?
Transcriptional responses in the brain, liver and gonad of Japanese ricefish (Oryzias latipes) exposed to two anti-estrogens.
The percentages of parasitic infection by gonad development stage and season of the year/seawater temperature are shown in Table 1.
Gonads, liver, kidney and gills are target organs for metals accumulation since they are metabolically actives accumulating metals sometimes in high levels [37].
In individuals having a gonad predominated by oogenic tissue and various developmental stages of oocytes, a small region appearing identical to inactive (non-secreting) TG tissue was present in the caudal region of the gonad closest to the gonoduct.
2012) this research identified 2584 siRNAs in the male gonad of sea urchin thereafter conduce to elucidate the biological roles of these small RNAs both in development and stress resistance.
Treatment with an Al also induces suppression of P450 gene expression in the gonads of genetic female flounder (Kitano et al.
In current study, it was observed that the highest levels of the MDA and GSH-Px were found in the hepatopancreas and gonad tissues when compared with muscle (P less than 0.
A gonadosomatic index, GSI=(GW/ GFBW)xlO0%, where GW=damp gonad weight and gonad-free body weight, GFBW=round weight minus GW, aggregated by month (years pooled) for each sex of adult fish, provided gravimetric evidence of gonadal growth.
The spawning season was determined through the temporal variation of the frequency of the gonad stages and by the temporal variation of the gonadosomatic index (GSI).
1, 1, 10, and 50 [micro]M) either by comparing one gonad cultured in medium containing Cd with the other gonad from the same fetus cultured in control medium (mouse) or by comparing pieces of the same gonad cultured with or without Cd (human).