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Fig. 6 | BMC Zoology

Fig. 6

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

Fig. 6

S. alveolata. Palp. TEM, cross-section. Epidermis mainly formed by unciliated supportive cell (suc) and two types of ciliated cells: in the median transverse rows of a few cells forming ciliary band (cb) and groove laterally flanked by separate ciliated cells (cc) with denser and longer cilia, ciliary band extends for entire length of palp, glandular cells (gc) with electron-lucent content embedded in epidermis, as well as two nerves (n), ciliated epidermal cells much thicker than unciliated supportive cell opposite to ciliary band, palp supplied with palp canal comprising two tubular coelomic cavities (coe), a single blind-ending blood vessel (bv) and muscular peritoneum; peritoneum primarily comprises musculature compressing the cavity, musculature with thin outer ring of circular muscle fibers (arrows) followed by prominent longitudinal fibers (lm),. blood vessel (bv) runs from the base to the tip of the palp, formed within the strand of ECM lined by peritoneal cells splitting the coelom into two parts, ECM connected to the circular ECM separating mesodermal from ectodermal tissues. Abbreviations: bv - blood vessel, cb - ciliary band, cc - ciliated cell, coe - coelom, cu - cuticle, gc - glandular cell, lm - longitudinal musculature, n - nerve, nc - nucleus

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