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Fig. 8 | BMC Zoology

Fig. 8

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

Fig. 8

S. alveolata. Branchiae. a Anterior-most right branchiae with internal longitudinal blood vessels (inner, ibrv, outer branchial vessel, obrv), arrowheads: ladder-like arranged transverse blood spaces, arrow: basal connecting vessel between ibrv and obrv, b Branchiae (1st pair) supplied with coelomic space (brcoe), outer and inner vessel (obrv, ibrv), interconnected at base of branchia (arrow), extending beside gut (g), c Blood supply of 2nd branchia, arrow: septum with basal connection of ibrv and obrv, separating branchial coelom (brcoe) from body cavity, d Right mid-body branchia, flattened side facing dorsum (asterisk), epidermis comprises glandular (gc), receptor (rc), unciliated supportive (suc) and ciliated cells (cc) belonging to straight (scb) and curved ciliary bands (ccb), transverse blood vessels (arrows) between epidermal cells originating from longitudinal vessels (arrowhead); coelom surrounded by peritoneum (pt) and ECM (ecm), e Regularly arranged transverse vessels (arrows) between epidermal supportive (suc) and glandular cells (gc), arrowheads: blood spaces close to surface, f Innervation of branchiae, anti-acetylated α-tubulin-immune-like reactivity, dorsal view; branchia innervated by two nerves (brn) with common origin where dorsal nerve (dn) meets main segmental nerve (sn), branchial nerves irregularly interconnected (arrowheads) giving off numerous dendritic processes with sensory cilia (arrows and inset). a Dissecting microscope, b-e LM, semi-thin cross sections; f cLSM: depth-coded 0 - 40 μm (yellow to purple). Abbreviations: bc - blood cell (hemocyte), br - branchia, brcoe - branchial coelom, brn - branchial nerve, cc - ciliated cell, ccb - curved ciliary band, coe - coelom, cu - cuticle, dbv - dorsal blood vessel, dlm - dorsal longitudinal musculature, dn - dorsal nerve, ecm - ECM, g - gut, gc - glandular cell, hb - heart body, ibrv - inner branchial vessel, neu - neuropodium, obrv - outer branchial vessel, pa - opercular palea, pt - peritoneum, rc - receptor cell, sc - sensory cilium, scb - straight ciliary band, sn - segmental nerve, suc - supportive cell, vlm - ventral longitudinal muscle, vnc - ventral nerve cord

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