Fig. 8.

Ultrastructure of body wall layer and nervous system. a Body wall of tentacle composed of vascularized epidermis and a single layer of longitudinal muscle cells; in between the basal matrix (arrowhead). b Detail of ventral ciliated field of the forepart showing neuropil of one cord of the bifurcated ventral nerve and small nerves (arrow head) innervating the ciliated cells. c Ciliated cells forming part of the dorsal furrow of a male specimen. d Ventral nerve cord and body wall layer of the posterior trunk region. Abbreviations: bc = bacteriocyte; bl = blood lacuna; cc = coelomic cavity; cf = ciliated field; cu = cuticle; ep = epidermis; mc = myocyte; ml = body wall muscle layer; mm = median mesentery; np = neuropil; vv ventral blood vessel