Germarium


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Ger`ma´ri`um


n.1.(Zool.) An organ in which the ova are developed in certain Turbellaria.
References in periodicals archive ?
Nulliparous stages were classified as: nulliparous 1 (where the germarium and vitellarium are not differentiated and are without follicles); nulliparous 2 (well-defined ovarioles with multiple follicles, the proximal follicle transparent indicating that it had not completed maturation); and nulliparous 3 (proximal follicle more opaque [mature] and close to ovulation).
Adults resulting from larvae treated with EOs presented fewer regenerative cells in the midguts, which were elongated with a narrower lumen and females presented germarium and follicular epithelium of the ovarioles with faint nuclei, prejudicing reproduction [128].
Egg development occurred anteriorly to posteriorly along the ovariole, with two distinctly recognizable regions: the germarium and the vitellarium.
In the Drosophila germarium, altered Wingless (Wg; the fly Wnt homologue) signaling occurs in ovarian germline stem cells (GSCs) through removal of its regulators such as dishevelled, armadillo, Axin, and shaggy; this causes GSC loss, influences follicle cell proliferation, and induces differentiation [34, 35].
mexicanus Harold, normally complete only three nesting cycles, after which (approximately 180 days following adult emergence) the germarium of the ovary is very reduced.
In insects treated with 200 ppm azadirachtin, the cyst formation around the spermatogonia in the germarium was inhibited without any further development to spermatocytes and with the appearance of many vacuoles (Figs 17, 18).
Germarium oval, 164-495 (365) in diameter, pretesticular; short uterus; vagina long, with distal papilliform structure (Fig.
The ovarioles were of the telotrophic meroistic type, wherein nurse cells in the distal germarium provide nutrients to developing follicles contained in the vitellarium (Chapman 1998).