Fine Structure of the Epithelium of the Gut in the Crayfish (<i>Procambarus clarkii</i>) with Special Reference to the Cytoplasmic Microtubules

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun

“…Studies with electron microscopy revealed that the gut epithelium usually consists of a single layer of cells joined by junctional complexes at the apical margin, and separated by lateral intercellular spaces (Komuro & Yamamoto, 1968;Georgi, 1969;Koulish, 1971;Talbot, Clark & Lawrence, 1972;Hootman & Conte, 1974;Holdich & Mayes, 1975;Quaglia, Sabelli & Villani, 1976;Mykles, 1977Mykles, , 1979Johnson, 1980;see Gibson & Barker, 1979 for a review on the hepatopancreas). Commonly observed features include microvillous apical borders, and elaborate infoldings of the lateral and basal membranes that are closely associated with numerous mitochondria.…”

Assessment of the feasibility of including high levels of oilseed meals in the diets of juvenile Chinese mitten crabs (Eriocheir sinensis): Effects on growth, non-specific immunity, hepatopancreatic function, and intestinal morphology

“…Furthermore, no goblet cells were found in the intestinal mucosa, which had been noted by Fang et al (2002). Most crustaceans, but perhaps not all (Komuro and Yamamoto, 1968;Miyawaki and Taketomi, 1984;To et al, 2004), produce a peritrophic membrane in the intestine (Martin et al, 2006). The primary function of the peritrophic membrane is to improve digestion (Bolognesi et al, 2008), provide mechanical (Lehane, 1997) and chemical protection (Dinglasan et al, 2009), and act as an infection barrier (Kato et al, 2008).…”

Morphology of the midgut trunk in the penaeid shrimp, Sicyonia ingentis, highlighting novel nuclear pore particles and fixed hemocytes

“…In S. ingentis, a similar change in granules may occur, but the secretory product is released by compound exocytosis. In P. aztecus (Talbot et al, 1971), P. setiferus (Lovette and Felder, 1990), P. clarkii (Komuro and Yamamoto, 1968), and M. rosenbergii (Cooke and Ahearn, 1976), electrondense granules are rare and mitochondria and multivesicular bodies are more commonly seen near the cell apex. In P. aztecus and P. setiferus the nuclei of the epithelial cells are basal, unlike the central position described for most other species.…”

“…The morphology of the MGT wall has been described for several decapods at the histological (Pillai, 1960;Dall, 1967;Rigdon and Mensik, 1976) and ultrastructural levels (Komuro and Yamamoto, 1968;Talbot et al, 1971;Cooke and Ahearn, 1976;Miyawaki and Taketomi, 1984;Lovett and Felder, 1990), and was recently reviewed by Icely and Nott (1992). The MGT wall appears similar in all species that have been studied, with a simple columnar epithelium separated from a layer of loose connective tissue by a thick basal lamina.…”