The fine structure of the kidney of Achatina achatina (L.)

Skelding, J. M.

doi:10.1007/bf00306597

Cited by 19 publications

(6 citation statements)

References 62 publications

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“…The cells lining the kidney sac are similar to those in the kidney sac of Achatina achatina (Skelding 1973). The basement membrane is permeable to ferritin in A. achatina but not in Helisoma.…”

Section: In Vitro Studiesmentioning

confidence: 97%

“…Skelding (1973), however, calculated colloidal osmotic pressures and blood pressures in some pulmonates and suggested that the hydrostatic pressure from the circulatory system could be sufficient to account for ultrafiltration across the kidney sac epithelium. The colloidal osmotic pressure in Helisoma could be very low, because the major haemolymph protein is haemoglobin with a molecular weight of 1.7…”

Section: In Vitro Studiesmentioning

confidence: 97%

“…Cells ultrastructurally similar to vertebrate podocytes have been described from the heart of two prosobranchs, Poteria lineata (Andrews and Little 1972) and Vi'iuiparus tliviparus (Boer et al 1973). However, in gastropods, such as Lymnaea stagnalis, Biomphalaria glabrata, Helix pomatia, Achatina achatina, and Helisoma anceps (Wendelaar Bonga and Boer 1969;Boer et al 1973;Bouillon 1960;Skelding 1973;Dillaman 1974), ultrastructural studies have not shown the presence of podocytes. van Aardt (1968) suggested that ultrafiltration in Lymnaea stagnalis occurs through the wall of the heart into the pericardial lumen.…”

Section: Introductionmentioning

confidence: 94%

“…Fewer than 50% of the cells contain excretory concretions. The cells in the kidney sac have been termed nephrocytes (Wendelaar Bonga and Boer 1969;Skelding 1973;Dillaman 1974) because of their excretory function; they contain dense crystalline material which is believed to represent excretory concretions. The cells have a basally located nucleus and lysosomes, and numerous interdigitating foot processes resting on an even basement membrane.…”

Section: Kidneymentioning

confidence: 99%

“…In Helix pomatia (Verwohl 1961) and Achatina fulica (Martin et al 1965), the kidney sac was suggested to be the site of ultrafiltration. Skelding (1973) and Newell and Skelding (1973) demonstrated filtration barriers in the kidney sac of Achatina achatina and Helix pomatia, respectively. Potts (1967) suggested that ultrafiltration in pulmonates may occur directly from the blood into the kidney sac.…”

Section: Introductionmentioning

confidence: 98%

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Effects of osmotic changes and neurosecretory extracts on kidney ultrastructure in the freshwater pulmonate Helisoma

Khan¹,

Saleuddin²

1979

Can. J. Zool.

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The ultrastructure of the heart and kidney, and the effects of media of different osmotic concentrations and of nervous tissue extracts, have been investigated in Helisoma duryi and H. trivolvis. The auricle and ventricle walls do not appear to be possible sites for urine formation. In the kidney sac, ferritin and carbon particles are retained by the basement membrane of the epithelium, whereas horseradish peroxidase passes through the basement membrane into the intercellular spaces 10 min after injection. Epithelial cells have deep basal membrane infoldings. Intercellular spaces and spaces in the infoldings are wide in snails kept in distilled water but narrow in snails kept in isosmotic saline. When kidney sacs from saline-acclimated snails were treated in vitro with visceral ganglion extract from snails kept in distilled water these spaces rapidly expanded. Visceral ganglion extract from snails kept in saline, or extracts of other ganglia, had no effect. It is suggested that urine formation occurs in the kidney sac, and that a factor (probably neurosecretory) from the visceral ganglion may act on kidney sac epithelium to alter the rate of filtration and fluid (prourine) transport.

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Section: In Vitro Studiesmentioning

confidence: 97%

Section: In Vitro Studiesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 94%

Section: Kidneymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Effects of osmotic changes and neurosecretory extracts on kidney ultrastructure in the freshwater pulmonate Helisoma

Khan¹,

Saleuddin²

1979

Can. J. Zool.

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Mollusca

Dennis

Molnár

Kriska

et al. 2021

Invertebrate Histology

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Ultrastructure of the tubular nephron of the garter snake Thamnophis sirtalis

Peek

McMillan

1979

Am. J. Anat.

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Ultrastructural features of the tubular nephron of the garter snake, with special reference to modifications for conservation of water, were studied using transmission electron microscopy, freeze-fracture and tracer experiments. Although a nephric loop (loop of Henle) is lacking, the tubules appear to be structurally well adapted for efficient ion and water reabsorption. The most prominent features are well developed microvilli in the proximal tubule and elaborate latteral folds, particularly in the distal tubule and collecting ducts. The latter structures are highly interdigitated, creating complex intercellular channels, perhaps facilitating transepithelial fluid transport. Only the proximal tubule actively absorbs and degrades protein tracers from the lumen. The cells of the collecting duct secrete mucus which may precipitate and bind urate salts in the lumen. This may be significant in the excretion of these salts, a process which combines maximal removal of salts and nitrogenous wastes with minimal loss of water.

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The fine structure of the kidney of Achatina achatina (L.)

Cited by 19 publications

References 62 publications

Effects of osmotic changes and neurosecretory extracts on kidney ultrastructure in the freshwater pulmonate Helisoma

Effects of osmotic changes and neurosecretory extracts on kidney ultrastructure in the freshwater pulmonate Helisoma

Mollusca

Ultrastructure of the tubular nephron of the garter snake Thamnophis sirtalis

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