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Fig. 3 | BMC Zoology

Fig. 3

From: Morphological and histological description of the midgut caeca in true crabs (Malacostraca: Decapoda: Brachyura): origin, development and potential role

Fig. 3

Maja brachydactyla. Adults. Tissue organization of the midgut caeca. General diagram of the adult midgut caeca (A). Anterior midgut caeca, general view, Haematoxylin-Eosin (B). Posterior midgut caecum, general view, Haematoxylin-Eosin (C). Anterior midgut caeca, detailed view of a caeca fold, PAS-Alcian Blue contrasted with Haematoxylin (D). Anterior midgut caeca, epithelial folds, SEM (E). Anterior midgut caeca, detailed view of the muscle fibres and connective, Mallory’s Trichrome (F). Posterior midgut caecum, detailed view of the muscle fibres and connective, TEM (G). Scale bars (μm): 2 (G), 20 (D, F), 50 (B–C), 100 (E). Abbreviations: arrow, cellular division; asterisk, inner layer of connective tissue; BC, basal cells; BL, basal lamina; CE, midgut caeca epithelium; CT, external layer of connective tissue; EF, epithelial folds; MF, muscle fibres; Mv; microvilli; My, myofibrils

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