Fig. 13From: The nervous system of the lophophore in the ctenostome Amathia gracilis provides insight into the morphology of ancestral ectoprocts and the monophyly of the lophophoratesUltrastructure of certain nerve elements in Amathia gracilis. Longitudinal (a) and transverse (b–c) ultrathin sections. a Outer nerve ring. b Basiperitoneal neurite on the lateral side of the tentacle. c Tentacle sheath nerve. Abbreviations: bpn - basiperitoneal neurite; cc - coelomic cavity; cu - cuticle; ECM - extracellular matrix; ept - epithelium; lcc - lining of coelomic cavity; mc - muscle cell; mi - microvilli; nf - nerve fibers; sr - striated rootletsBack to article page