Endocrinology

Joosse, J.; Geraerts, W.P.M.

doi:10.1016/b978-0-12-751404-8.50016-5

Cited by 53 publications

(8 citation statements)

References 173 publications

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“…In mollusks, such techniques of recording from nerves (Pinsker and Dudek 1977) as well as from identified single neurons (Parsons et al 1983) have recently been developed. The egg-laying behavior of the pond snail Lymnaea stagnalis has been studied extensively (for review see Joosse and Geraerts 1983). The neurosecretory caudodorsal cells (CDCs) are the source of the ovulation hormone that releases egg cells from the ovotestis (Geraerts and Bohlken 1976).…”

Section: Introductionmentioning

confidence: 99%

In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

1986

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Section: Introductionmentioning

confidence: 99%

In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

1986

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“…The neurons of the metacerebrum could preferentially innervate the supraesophageal portion of the DB, while the parietal neurons could innervate the subesophageal DB cells. Although the innervation of the DB cells has been described for all the analysed stylommatophorans, it has rarely been described for the DB in basommatophoran snails (see reviews: Joosse and Geraerts, 1983;Luchtel et al, 1997). However, DB cells appear to be innervated by cerebral ganglia in Helisoma duryi and Siphonaria pectinata (Saleuddin and Ashton, 1996;Saleuddin et al, 1997), but no synapse-like structures have been found in these animals.…”

Section: Discussionmentioning

confidence: 99%

“…The DB synthesises a hormone that influences vitellogenesis, and the differentiation and growth of the accessory sex glands of the feminine portion of the genital system (Joosse and Geraerts, 1983;Flari and Edwards, 2003).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural analysis of the dorsal body gland of the terrestrial snail Megalobulimus abbreviatus (Becquaert, 1948)

Piva

Gonçalves

2010

Braz. J. Biol.

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The ultrastructure of the reproductive gland, dorsal body (DB), of Megalobulimus abbreviatus was analysed. Electron microscope immunohistochemistry was used to detect FMRFamide-like peptides in the nerve endings within this gland. Nerve backfilling was used in an attempt to identify the neurons involved in this innervation. In M. abbreviatus, the DB has a uniform appearance throughout their supraesophageal and subesophageal portions. Dorsal body cells have several features in common with steroid-secreting gland cells, such as the presence of many lipid droplets, numerous mitochondria with tubular cristae and a developed smooth endoplasmic reticulum cisternae. Throughout the DB in M. abbreviatus numerous axonal endings were seen to be in contact with the DB cells exhibiting a synapticlike structure. The axon terminals contained numerous electron-dense and scanty electron-lucid vesicles. In addition, the DB nerve endings exhibited FMRFamide immunoreactive vesicles. Injection of neural tracer into the DB yielded retrograde labelling of neurons in the metacerebrum lobe of the cerebral ganglia and in the parietal ganglia of the subesophageal ganglia complex. The possibility that some of these retrograde-labelled neurons might be FMRFamidelike neurons that may represent a neural control to the DB in M. abbreviatus is discussed.Keywords: mollusc, endocrine gland, FMRFamide, cerebral ganglia, reproductive control. Análise ultraestrutural da glândula corpo dorsal do caracol terrestre Megalobulimus abbreviatus (Becquaert, 1948) ResumoFoi analisada a ultraestrutura da glândula reprodutiva corpo dorsal (CD) de Megalobulimus abbreviatus. Imunoistoquímica para microscopia eletrônica foi utilizada para detectar peptídeos relacionados ao tetrapeptídeo FMRFamida nas terminações axonais existentes nessa glândula. Foi utilizada marcação neuronal retrógada com o intuito de localizar os neurônios envolvidos nesta inervação. O CD de M. abbreviatus possui um aspecto uniforme em toda sua extensão, tanto na porção supraesofágica como subesofágica. As células do CD possuem várias características de glândulas esteroidogênicas, tais como a presença de inúmeras gotículas lipídicas, numerosas mitocôndrias com cristas tubulares e cisternas bem desenvolvidas de retículo endoplasmático liso. Por toda a extensão do CD de M. abbreviatus foram encontradas numerosas terminações axonais fazendo contatos estruturalmente semelhantes a sinapses com as células do CD. As terminações axonais continham grande número de vesículas eletrodensas e esparsas vesículas eletrolúcidas. As terminações axonais no CD apresentavam vesículas com conteúdo imunorreativo à FMRFamida. A injeção de traçador neural no CD resultou em marcação retrógrada de neurônios no metacérebro dos gânglios cerebrais e nos gânglios parietais do complexo ganglionar subesofágico de M. abbreviatus. É discutida a possibilidade de que estes neurônios identificados por marcação retrógrada possam representar a via de controle neural do CD de M. abbreviatus, cujo mediador químico seria um n...

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“…In molluscs, glycogen is an important reserve material which is present in all cells (Joosse and Geraerts 1983). Although a special compartment for glycogen storage is also common, such as in the mantle edge of many bivalves and in the vesicular connective tissue cells of some gastropods (De Zwaan 1977), several families of bivalves (e.g.…”

Section: Discussionmentioning

confidence: 99%

Histology and biochemical composition of the autotomy mantle of Ficus ficus (Mesogastropoda: Ficidae)

Liu

Wang

2002

Acta Zoologica

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When the foot of the figsnail Ficus ficus is mechanically stimulated, a portion of the mantle on the side of the inner lip, recognized as the autotomy tissue, swells then autotomizes. Studies of the behaviour and population dynamics of mantle autotomy in F. ficus have previously been reported, but here, a detailed description of the structure of the autotomy tissue is presented for the first time. Whether or not this autotomy tissue has the secondary function of a storage compartment was also investigated through analysis of its biochemical composition. Figsnails were collected from the coast of Kaohsiung, Taiwan. Histological observations indicated that the most obvious feature of the autotomy tissue is the extensive network of muscle fibres and connective tissues. In the swollen autotomy tissue, not only do the epithelia rupture, but the connective tissue expands threefold on the dorsal side and 15‐fold on the ventral side. Chemical analysis of body composition indicated that the average contents of protein, lipid, carbohydrate and ash in the foot, mantle and autotomy tissue are in the range of 55.6–76.5%, 0.6–14.1%, 2.0–27.9% and 6.5–13.5%, respectively, with the caloric value ranging from 4.7 to 5.5 kcal g−1 dry wt. The content of carbohydrate in the autotomy tissue is much less than that in the foot and mantle, i.e. 2.0–6.8% vs. 13.0–27.9%. There is no indication that the autotomy tissue serves as an energy reserve. Hence, it is suggested that the autotomy tissue functions only as a defensive weapon.

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Endocrinology

Cited by 53 publications

References 173 publications

In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

In vivo recordings of neuroendocrine cells (caudo-dorsal cells) in the pond snail

Ultrastructural analysis of the dorsal body gland of the terrestrial snail Megalobulimus abbreviatus (Becquaert, 1948)

Histology and biochemical composition of the autotomy mantle of Ficus ficus (Mesogastropoda: Ficidae)

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