The fine structure of digestive‐gland cells of <i>Helix, Succinea</i> and <i>Testacella</i>

Sumner, A. T.

doi:10.1111/j.1365-2818.1966.tb02179.x

Cited by 23 publications

(3 citation statements)

References 29 publications

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“…Early reports have clarified the histology of the alimentary tract of many molluscan species (Mackintosh 1925;Yonge 1926;Millott 1937;Graham 1932Graham , 1938Fretter 1936Fretter , 1939Morton 1951), but these have been limited by the low resolution of light microscopy. Few ultrastructural studies have been published, none on the nerite, and early electron microscopic reports did not show cellular detail as is presently possible (Sumner 19656). The present observations are the first on the neritid intestine, and they demonstrate that the intestinal histology of this species closely resembles that of the rock chiton, Acanthopleura spinigera (Greenfield 1972).…”

Section: Discussioncontrasting

confidence: 40%

Intestinal Ultrastructure of Nerita picea (Mollusca: Gastropoda), an Intertidal Marine Snail of Hawaii

Pfeiffer

1992

Acta Zoologica

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Pfeiffer, C. J . 1992. Intestinal ultrastructure of Neritapicea (Mollusca: Gastropoda), an intertidal marine snail of Hawaii.-Acta Zoologica (Stockholm) 73: 39-47.The neritid snail Neritapicea is a marine prosobranch mollusc which resides high in the intertidal zone on the Hawaiian Islands. Since other studies have shown considerable variations in molluscan gut histology and the relatively few recent ultrastructural reports have revealed novel cellular structures in the molluscan gastrointestinal tract, this investigation was directed toward ultrastructural clarification of the neritid intestine.Seven principal cell types constituted the intestinal architecture, including absorptive cells, rymogen cells, neural and endocrine cells, myocytes, pigment and gland cells. The intestinal epithelium was composed mainly of tall ciliated (9 plus 2 complement of microtubules) columnar absorptive cells which also possessed microvilli, extensive deposits of non-membrane-bound lipid-like droplets, and large reservoirs of glycogen-like granules. Less frequent, columnar zymogen cells contained numerous large zymogen secretory granules and possessed microvilli but not cilia. Small endocrine-like cells with secretory granules were observed basolaterally between some absorptive cells, resembling mammalian gut endocrine cells. Nerve fibers were prevalent in close association with the epithelial cells. A thin layer of non-striated muscle was present, as well as a serosally located gland composed of storage cells with a granular matrix and large granules.

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Section: Discussioncontrasting

confidence: 40%

Intestinal Ultrastructure of Nerita picea (Mollusca: Gastropoda), an Intertidal Marine Snail of Hawaii

Pfeiffer

1992

Acta Zoologica

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“…Calcium cells, like basiphilic cells of bivalves (Sumner, 1966c, Owen, 1972, are pyramidal in shape and possess a conspicuous nucleus, well-developed RER and an extensive Golgi complex. The secretory activity is controlled by the release of small granules in the tubular lumen.…”

Section: Discussionmentioning

confidence: 99%

Histochemistry and Ultrastructure of the Crypt Cells in the Digestive Gland of Aplysia Punctata (Cuvier, 1803)

Taïeb¹,

Vicente²

1999

Journal of Molluscan Studies

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The crypt cells lining the Aplysia punctata digestive tubules comprise of three types of cell; calcium, excretory, and thin cells. The calcium cells play a role in osmoregulation, mineral storage, exocrine secretion, iron detoxification, and excretion processes. They possess well-developed microvilli and a basal labyrinth, suggesting a role in absorption. The Golgi apparatus is involved in the production of two main components of calcium spherules; the fibrillar material and mineralized granules. Golgi complex, rough endoplasmic reticulum (RER), ribosomes, and altered mitochondria are involved in the formation of calcium spherules. Secretory activity is indicated by the formation of dense granules containing iron and calcium salts. Lipofuscin pigment has been found in large concretions which may arise from cytoplasmic areas surrounded by endoplasmic reticulum, RER and Golgi tubules. There are three stages of excretory cells, called early, mature, and postexcretory cells. This study traces the development of granulofibrillar vacuoles up to the formation of the lipofuscin concretions and shows that excretory cells are in fact degenerating calcium cells. The fine structure of thin cells suggests that they are young calcium cells.

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“…За допомогою світлового мікроскопа були проведені дослідження клітин травної залози легеневих черевоногих (Sumner, 1965). Також проводились дослідження клітин травної залози легеневих равликів з використанням електронного мікроскопа (Sumner, 1965;1966).…”

Section: вступunclassified

Morphological characteristics of respiratory and digestive organs of Roman snail (Helix pomatia L., 1758)

Horvat

Dankovych

2020

SMLNUVMB

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The aim of this work was to study the structure of lung and hepatopancreas of Roman snail (Helix of pomatia of L., 1758). The study found that the lung occupies the lower turn of shell and presented by a saccate cavity, in the wall of that there are a kidney and heart with a pericardium, and also a rectum and ureter pass. An external surface of lungs covered by a shell and covered by an epidermis. An internal surface is covered by a flat ciliated epithelium and forms numerous folds in which pulmonary vessels and lacunae are accommodated. The branches of pulmonary vein have a thick muscular wall, that consists of circular and longitudinal muscular layers. An internal surface of lungs covered by the layer of mucus. Inhalation and exhalation are carried out due to reduction and relaxation of muscles of dorsal wall of the body that is named a “diaphragm”. Gas exchange occurs through the hemolymphatic capillaries of the lung wall. Respiratory motions take place not rhythmically, but through the different intervals of time depending on a requirement in oxygen. The frequency of pneumostome closing and opening is typically one time in a minute. At subzero humidity of atmospheric air of pneumostome closed by a mantle, and also one (or a few) epiphragms. The hepatopancreas (“liver” or liver gland) is in the upper rotation of the sink and formed by two parts: right and left, from which two liver ducts enter into the stomach respectively. The liver gland consists of many acinuss, surrounded by connecting tissue, that contains small number of muscular fibres. Calcium cells have a pyramidal form and usually do not reach the lumen of the acinus. Cytoplasm of calcium cells contains inclusions: grains of phosphoricacid lime and drops of fat. The digestive cells of the hepatopencreas are more elongated, often clavicular. Сytoplasm of digestive cells is loose and vacuolated and contain inclusions of yellow-green color. Enzyme cells on histopreparations are difficult to distinguish from digestive ones. They contain transparent vacuoles with a large round inclusion of yellow-green color, which consists of a cluster of several grains of different sizes. Hepatopancreas performs the following functions: secretory (enzyme cells), absorption and intracellular digestion (digestive cells), preservation of nutrients and calcium (calcium cells), and also excretory function.

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The fine structure of digestive‐gland cells of Helix, Succinea and Testacella

Cited by 23 publications

References 29 publications

Intestinal Ultrastructure of Nerita picea (Mollusca: Gastropoda), an Intertidal Marine Snail of Hawaii

Intestinal Ultrastructure of Nerita picea (Mollusca: Gastropoda), an Intertidal Marine Snail of Hawaii

Histochemistry and Ultrastructure of the Crypt Cells in the Digestive Gland of Aplysia Punctata (Cuvier, 1803)

Morphological characteristics of respiratory and digestive organs of Roman snail (Helix pomatia L., 1758)

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