Fig. 8

Sensory and neuronal elements of the forepart. a, b. Sensory area of the cephalic lobe at the base of tentacles. c. Forepart before the bridle, ventral view. Nerve plexus of the body wall adjacent to the ventral nerve cords. d. Forepart after the bridle ventral view. e, f. Successive partial Z-projections of the body wall at the area of the dorsal furrow showing openings of tubiparous glands surrounded by sensory cilia (e), and innervation of tubiparous glands by dorsal nerves (f). Abbreviations: b – bridle, dn – dorsal nerve, dnp – diffuse nerve plexus, m – musculature, nr – neurites, og – tubiparous gland duct opening, pn – perikaryon, sci – sensory cilia, vnc – ventral nerve cord. Muscles – yellow (phalloidin staining), acetylated α-tubulin-lir – magenta, 5HT-lir – red, cell nuclei – blue (DAPI staining)