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Fig. 4 | BMC Zoology

Fig. 4

From: Ultrastructure and functional morphology of the appendages in the reef-building sedentary polychaete Sabellaria alveolata (Annelida, Sedentaria, Sabellida)

Fig. 4

S. alveolata. Tentacular filament, TEM, cross-section. Epidermis composed of unciliated supportive cells (suc) with basal-apical intermediate filaments (arrowheads), ciliated cells (cc) and glandular cells (gc). On the frontal side, numerous cilia (cl) penetrate the cuticle (cu) forming the ciliary band. Internally prominent u-shaped, hyaline cartilage structure (hc) located somewhat eccentrically, cartilage structure sheathed by conspicuous ECM, also connecting its upper ends (arrows) and surrounding a central muscle bundle; musculature primarily comprising longitudinal muscle fibers (lm) attached spirally to the ECM and running from the base to the tip of the filament. Glandular cells (gc) interspersed between ciliated cells on frontal side (fs); asterisks refer to intercellular spaces, nuclei (nc) of supportive cells show different staining. Abbreviations: cc - ciliated cell, cl - cilium, cu - cuticle, fs - frontal side, gc - glandular cell, hc - hyaline cartilage structure, lm - longitudinal muscle, mv - microvillus, suc - supportive cell

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BMC Zoology

ISSN: 2056-3132

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