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.
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.
Juvenile hormone comes from a pair of endocrine organs known as corpora allata. About 0.2 millimeters long, they lie at the stem of the mealworm beetle's brain.
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.
Decapitation was used to remove the corpora allata, the source of JH in intact animals.
The corpora allata (CA), paired-sphere shaped organs of the retrocerebral neuroendocrine complex, are the glandular source of juvenile hormone (JH) in insects.
The corpora allata (CA) arise in early embryonic development (40%D) from intersegmental invaginations anterior to the maxillary segment (Gassier 1998).