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 ?
The same tests were applied to compare the effect of sex and the degree of gonad development on the levels of the biochemical components.
Four slides from each whelk gonad were examined to determine sex and gonad stage.
5 dpc; at this stage, each gonad contained around 5,000 oogonia (Figure 3A).
The position of the gonads was considered to be within the scrotal sac below the pubic arch which is readily visible on a plain pelvic radiograph.
Only the right gonad of patient 13 showed a normal number of Sertoli cells.
In this study, Atrina pectinata were sampled in the shallow sea of Rizhao, where the temperature was monitored almost every day, and the process of gonad development was studied through morphological and histological observations.
Evidence of spawning from gonad indices, together with estimates of the proportional incidence of spawning females, convincingly illustrates that Hawaiian grouper spawn in the NWHI during the first and second quarters of the calendar year, peak ripening occurs in December-April, and peak spawning follows several months later (in February-June).
Portions from each end and the midsection of the gonad lobes were immersed in 10% formalin to maintain protein structure and composition.
Gonad somatic index were almost similar as expected but significant difference (P > 0.
The gonad is made up of interconnected gonadal alveoli and it surrounds the digestive gland.
This includes gonad morphology (external and cellular description of the ovary and testis), reproductive pattern (hermaphoditism or gonocorism), reproductive behavior, reproductive cycle, spawning season duration, size at maturity, sex ratio, size at sexual transition, and fecundity.
In males, plasma androgens and gonad size were negatively correlated with total DDT, total pesticides, and PCBs.