Publication: A histological, histochemical and ultrastructural study of the digestive tract of Dentex dentex (Pisces, Sparidae)
Authors
Carrassón, M. ; Grau, A. ; Dopazo, L.R. ; Crespo, S.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Dentex dentex has a short esophagus, a large
caecal type stomach, three to six pyloric caeca and a
short intestine. Light and electron microscope studies
reveal that the esophageal mucosa displays primary and
secondary folds, a stratified squamous epithelium with
fingerprint-like microridges alternating with a few zones
formed by a single layer of columnar cells with apical
microvilli. Only primary folds are present in the
stomach, which is rich in simple tubular glands, these
being absent in the pyloric valve. Two cell types occur in
the gastric glands, one with a well developed apical
intracytoplasmic membrane system consisting of a
vesicular network of smooth membranes, and the other
with a supranuclear tubulovesicular system. Pyloric
caeca and anterior and posterior intestine mucosae
display the same pattern of folding, with primary and
secondary folds, without following a definite pattern in
their orientation. In the rectum, the folds are oriented
longitudinally. Small dense particles containing
chylomicrons appear in groups in the intercellular spaces
of the caecal and anterior intestinal epithelia.
Eosinophilic granular cells (mast cells) appear along the
digestive tract mainly within the stratum compactum.
Histochemical studies reveal no differences in the
composition of goblet cell mucus along the digestive
tract. No histochemical differences were detected
between enterocytes of the intestine, pyloric caeca and
rectum. Neutral mucosubstances dominate in the
stomach epithelium and in the goblet cells of the
esophagus, pyloric caeca and anterior intestine. Results
of the present study are discussed in relation to
descriptions of the digestive tract in other sparids.
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