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Ultrastructure of the hepatopancreas of the Pacific white shrimp, Penaeus vannamei (Crustacea: Decapoda)

Published online by Cambridge University Press:  11 May 2009

Thomas Caceci ,
Kay F. Neck ,
Donal D H. Lewis  and
Raymond F. Sis
Thomas Caceci
Affiliation:
Department of Veterinary Biosciences, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, U.S.A.
Kay F. Neck
Affiliation:
Department of Veterinary Anatomy
Donal D H. Lewis
Affiliation:
Department of Veterinary Microbiology and Parasitology, Texas Veterinary Medical Center, Texas A & M University, College Station, Texas 77843, U.S.A.
Raymond F. Sis
Affiliation:
Department of Veterinary Anatomy
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Abstract

Fourteen specimens of the hepatopancreas of the Pacific white shrimp, Penaeus vannamei, were prepared for examination with the transmission and scanning electron microscopes and with the light microscope. The histology and ultrastructure of this organ is similar to that seen in other Decapoda. At the ultrastructural level, it was observed that B-cells rupture at approximately the level of gap junctions located on the lateral plasma membranes of the cells, and discharge the contents of their large vacuoles into the intercellular space. This efflux of enzymatic material may be the mechanism by which cells are released from the wall of the tubule at the proximal end: the rupture and collapse of a B-cell may be analagous to the removal of the keystone which supports an arch. Deprived of support, and lacking structural adaptations for cohesion (there are no desmosomes or interdigitations in the epithelium) and with the intercellular material digested, the remaining intact cells collapse into the lumen of the tubule. The lysis of individual cells of all types - R-, F-, and B-cells - may contribute to the tubules’ total complement of digestive enzymes.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 68 , Issue 2 , May 1988 , pp. 323 - 337
Copyright
Copyright © Marine Biological Association of the United Kingdom 1988

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