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Fig. 9 | Parasites & Vectors

Fig. 9

From: Complex insight on microanatomy of larval “human broad tapeworm” Dibothriocephalus latus (Cestoda: Diphyllobothriidea)

Fig. 9

TEM micrographs of flame cells and excretory ducts of Dibothriocephalus latus plerocercoids. Longitudinal section of a flame cell showing the large nucleus with several heterochromatic regions, cytoplasmic region with vesicles and mitochondria and “flame” of cilium (a). Section through the flame cell showing the cell body attached to the flame through striated rootlets (b). Cross-section though the flame cell showing internal ribs of flame cell origin and external ribs of duct cell origin. Ribs are connected by a fibrous sheet (c). Section through the flame cell showing cilia with basal bodies and striated rootlets (d). Cross-section showing internal leptotriches arising from the flame cell situated between the cilia and ribs (e). Cross-section through the “flame” of a flame cell showing the cilia with their typical 9 + 2 pattern of microtubules (f). Sections of an excretory duct cell with the nucleus and the lumen and surrounding cytoplasm containing mitochondria and numerous vesicles, some of which may contain electron-dense material (g). The inner surface of the ducts is expanded by numerous microvilli (arrowhead) (h). Abbreviations: BB, basal body; C, cilia; CM, circular muscles; ER, external ribs; FC, flame cell; FS, fibrous sheet; IL, internal leptotriches; IR, internal ribs; L, lumen; LD, lipid droplets; MT, mitochondria; N, nucleus; NU, nucleolus; NF, nerve fibre; SG, secretory granules; V, vesicles; RT, rootlets

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