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Development of the digestive tract of sea bass (Dicentrarchus labrax L). Light and electron microscopic studies.
Anat Embryol (Berl). 2001 Jul; 204(1):39-57.AE

Abstract

The developing gut of sea bass was studied by light and electron microscopy, four phases being established. Phase I, from hatching to the opening of the mouth, was a lecitotrophic period, in which the gut appeared as a straight undifferentiated tube lined by a simple epithelium that became stratified in the most caudal region. The epithelial cells increased in length towards the caudal zone, as did the number and height of the apical microvilli and the magnitude of the lamellar structures in their basal region. Cilia were more numerous in the caudal region than in the rest of the gut. Signs of lipid but not of protein absorption were found in the epithelial cells at this phase. Phase II, from the opening of the mouth to the complete resorption of the yolk sac, was a lecitoexotrophic period in which an esophagus, a gastric region, an intestine and a rectum, the last two separated by a valve, were present. During this phase the differentiation of the gut started at the esophagus and the rectum. In the esophagus, the epithelium became stratified and goblet cells containing acid mucosubstances, including sulphomucins, appeared. In the epithelial cells of the rectum, supranuclear vacuoles and an incipient endocytotic apparatus that seemed to be involved in the absorption and digestion of proteins were found. In both regions the mucosa was folded. Phase III, from the complete resorption of the yolk sac to the appearance of the first gastric glands, initiated the exclusively exotrophic period. During this phase the intestine formed the mucosa folds, while the first pyloric caeca and the epithelial cells acquired the ultrastructural features of mature absorptive cells with many lipid inclusions. Goblet cells containing neutral mucosubstances appeared and increased in number in both the intestine and the rectum. Neutral mucosubstances were also present in the cells lining the gastric region. During phase IV, from the appearance of the first gastric glands onwards, the intestinal absorptive surface increased with the formation of new pyloric caeca and two intestinal loops. The stomach acquired its definitive anatomy and histology with the development of the caecal and pyloric regions alongside differentiated gastric glands. The glandular cells had the ultrastructural features of the cells that secrete both pepsinogen and hydrochloride acid in the adult teleost stomach.

Authors+Show Affiliations

Department of Cell Biology, Faculty of Biology, University of Murcia, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11506432

Citation

García Hernández, M P., et al. "Development of the Digestive Tract of Sea Bass (Dicentrarchus Labrax L). Light and Electron Microscopic Studies." Anatomy and Embryology, vol. 204, no. 1, 2001, pp. 39-57.
García Hernández MP, Lozano MT, Elbal MT, et al. Development of the digestive tract of sea bass (Dicentrarchus labrax L). Light and electron microscopic studies. Anat Embryol. 2001;204(1):39-57.
García Hernández, M. P., Lozano, M. T., Elbal, M. T., & Agulleiro, B. (2001). Development of the digestive tract of sea bass (Dicentrarchus labrax L). Light and electron microscopic studies. Anatomy and Embryology, 204(1), 39-57.
García Hernández MP, et al. Development of the Digestive Tract of Sea Bass (Dicentrarchus Labrax L). Light and Electron Microscopic Studies. Anat Embryol. 2001;204(1):39-57. PubMed PMID: 11506432.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development of the digestive tract of sea bass (Dicentrarchus labrax L). Light and electron microscopic studies. AU - García Hernández,M P, AU - Lozano,M T, AU - Elbal,M T, AU - Agulleiro,B, PY - 2001/8/17/pubmed PY - 2002/1/5/medline PY - 2001/8/17/entrez SP - 39 EP - 57 JF - Anatomy and embryology JO - Anat. Embryol. VL - 204 IS - 1 N2 - The developing gut of sea bass was studied by light and electron microscopy, four phases being established. Phase I, from hatching to the opening of the mouth, was a lecitotrophic period, in which the gut appeared as a straight undifferentiated tube lined by a simple epithelium that became stratified in the most caudal region. The epithelial cells increased in length towards the caudal zone, as did the number and height of the apical microvilli and the magnitude of the lamellar structures in their basal region. Cilia were more numerous in the caudal region than in the rest of the gut. Signs of lipid but not of protein absorption were found in the epithelial cells at this phase. Phase II, from the opening of the mouth to the complete resorption of the yolk sac, was a lecitoexotrophic period in which an esophagus, a gastric region, an intestine and a rectum, the last two separated by a valve, were present. During this phase the differentiation of the gut started at the esophagus and the rectum. In the esophagus, the epithelium became stratified and goblet cells containing acid mucosubstances, including sulphomucins, appeared. In the epithelial cells of the rectum, supranuclear vacuoles and an incipient endocytotic apparatus that seemed to be involved in the absorption and digestion of proteins were found. In both regions the mucosa was folded. Phase III, from the complete resorption of the yolk sac to the appearance of the first gastric glands, initiated the exclusively exotrophic period. During this phase the intestine formed the mucosa folds, while the first pyloric caeca and the epithelial cells acquired the ultrastructural features of mature absorptive cells with many lipid inclusions. Goblet cells containing neutral mucosubstances appeared and increased in number in both the intestine and the rectum. Neutral mucosubstances were also present in the cells lining the gastric region. During phase IV, from the appearance of the first gastric glands onwards, the intestinal absorptive surface increased with the formation of new pyloric caeca and two intestinal loops. The stomach acquired its definitive anatomy and histology with the development of the caecal and pyloric regions alongside differentiated gastric glands. The glandular cells had the ultrastructural features of the cells that secrete both pepsinogen and hydrochloride acid in the adult teleost stomach. SN - 0340-2061 UR - https://www.unboundmedicine.com/medline/citation/11506432/Development_of_the_digestive_tract_of_sea_bass__Dicentrarchus_labrax_L___Light_and_electron_microscopic_studies_ L2 - https://dx.doi.org/10.1007/s004290100173 DB - PRIME DP - Unbound Medicine ER -
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