. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF M1DGUT FUNCTION 167 V lu :••••- ,. Figure 4. Epithelia of larval midgut caeca and postlarval anterior midgut diverticulum in fcimciix Si'lijerus. A, lateral midgut caecum. B, anterior midgut caecum. C, anterior midgut diverticulum. (bl, basal lamina; g, Golgi bodies; gc, glycocalyx; lu. lumen; m, mitochondrion; mv, microvilli; n. nucleus; rer. rough endoplasmic reticulum; sv, secretory vesicle; tj, tight junction; v. vacuole; asterisk indicates electron dense epithelium ventral to lumen of anterior diverticulum;
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF M1DGUT FUNCTION 167 V lu :••••- ,. Figure 4. Epithelia of larval midgut caeca and postlarval anterior midgut diverticulum in fcimciix Si'lijerus. A, lateral midgut caecum. B, anterior midgut caecum. C, anterior midgut diverticulum. (bl, basal lamina; g, Golgi bodies; gc, glycocalyx; lu. lumen; m, mitochondrion; mv, microvilli; n. nucleus; rer. rough endoplasmic reticulum; sv, secretory vesicle; tj, tight junction; v. vacuole; asterisk indicates electron dense epithelium ventral to lumen of anterior diverticulum; arrow indicates undulatory lateral membranes). A. B, larval stage Protozoea 3. C, postlarval stage PL,5. Scale bar indicates /im for A and B and 4 ^m forC. sorption has yet to be demonstrated, tissues in which al- kaline phosphatase activity is present are generally thought to function in absorption by active transport (see review by McCombet al., 1979). Localization ofamylase and protease activity within the hepatopancreas in the present study is consistent with previous detection ofam- ylase and tryptic activity within B-cells of the hepatopan- creas of other decapod species (Malcoste et al., 1983; De- Villez and Fyler, 1986). Localization of alkaline phos- phatase in the hepatopancreas of P. set (ferns in the present study is consistent with the absorption usually attributed to this tissue (Gibson and Barker, 1979; Dall and Moriarty, 1983). Ultrastructure also has been used to infer that the hepatopancreas functions in protein syn- thesis, secretion, and absorption in Penaeus (Al-Mo- hanna et 1985b; Vogt, 1985; Al-Mohanna and Nott,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual r
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
