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 ?
Environmental exposure to dioxins and polychlorinated biphenyls reduce levels of gonadal hormones in newborns: results from the Duisburg cohort study.
Thus findings from epidemiologic studies are not conclusive as to whether exposure to environmental levels of PEs can cause sperm damage and/or disrupt the gonadal hormone balances in adult males.
Other factors that were not considered, such as gonadal hormone receptors and the postreceptor area, may have been involved.
Instead, they are influenced at least partly by the presence or absence of gonadal hormones, specifically the male gonadal hormone testosterone (48).
The remarkable differences between male and female offspring in how TCDD affected operant behavior strongly suggest that its influence is exerted through the effect of gonadal hormones on brain development.
Exposure to chemicals that perturb the delicate balance of gonadal hormones during early development could result in changes in hippocampal morphology and alter the normal pattern of male/female differences in spatial learning.
Gonadal hormones appear to provide a tonic inhibitory function on the thymus; gonadectomy in adulthood leads to an increase in thymic tissue, whereas estrogen can produce thymic involution.
D2, but not D1, dopamine receptor overproduction is influenced by gonadal hormones during adolescence.
Gonadal hormone modulation of neurogenesis in the dentate gyrus of adult male and female rodents.