Corpora Allata

Corpora Allata

 

glands of internal secretion in insects. Corpora allata are a pair of small, compact glandular organs covered with connective-tissue membrane. They are modified coelomoducts of the maxillary segment of the head and are located behind the brain above the fore-intestine. The function of the corpora allata is regulated by the sympathetic nervous system. They elaborate juvenile hormone, which prevents conversion of the larva to a pupa and to an adult insect and stimulates growth and development of larval organs. In the final larval stage, the action of juvenile hormone gradually diminishes. This is because its concentration in the blood decreases, since the growth of the larval body exceeds that of the corpora allata. Removal of the corpora allata in a larva causes premature metamorphosis into a miniature adult individual. In adult insects the hormone of the corpora allata stimulates maturation of the sex cells.

REFERENCE

See references under INSECTS.
References in periodicals archive ?
Although degradation plays a role, JH titer is primarily determined by the rate of biosynthesis in the corpora allata gland (CA).
In summary, integrative approaches using CA metabolomics, genomics, and proteomics are promising tactics to identify regulatory points in the flux of precursors in the JH synthesis pathway and unveil the molecular mysteries of a complex metabolic system such as the synthesis of juvenile hormone in the corpora allata of insects.
Shinoda, "Control of juvenile hormone biosynthesis in Bombyx mori: cloning of the enzymes in the mevalonate pathway and assessment of their developmental expression in the corpora allata," Insect Biochemistry and Molecular Biology, vol.
Typically, the RCC consists of paired corpora cardiaca (CC) and paired corpora allata (CA) (Cazal 1948).
The activity of denerved corpora allata in a diapausing strain of Locusta migratoria: in vivo and in vitro studies.
An allatostatic factor and juvenile hormone synthesis by corpora allata in Locusta migratoria.
2008), identificandose como corpora allata y corpora cardiaca (Fig.
Las corpora cardiaca, junto con las corpora allata, el ganglio subesofagico y el cerebro, forman un complejo neurosecretor que se encarga de producir varios grupos de neuropeptidos (Nps) que actuan como mensajeros quimicos extracelulares.
Siva-Jothy and Rolff permitted some of their beetles to mate, then transferred the insects' corpora allata to virgin beetles.
When virgins received corpora allata from mated beetles, their phenoloxidase activity dropped--about a fifth for males and a half for females--compared with virgins receiving transplants from unmated donors.
The corpora allata (CA) arise in early embryonic development (40%D) from intersegmental invaginations anterior to the maxillary segment (Gassier 1998).
This hormone activates the corpora allata and the prothoracic glands responsible for regulating growth (Wigglesworth 1972).