Figure 24. Carinina ochracea, schematic drawing of a dorsal view on the central nervous system, based on 3D-reconstruction of 160 aligned 0.5 µm sections.

The nervous system is composed of neuropil (np, gray) which may be surrounded by cell somata (cs, blue). Cephalic nerves (cn) form basiepidermal basket, the paired proboscidial nerves (pn, yellow) originate from the ventral commissural tract (vct). A dorsal nerve strand (dn) originates from the dorsal commissural tract (dct). A second dorsal nerve (2dn) runs underneath the dorsal nerve. The cerebral organs (co, green) gain contact to the environment via small canals (ca, red), which open laterally. The cerebral organ is connected to the dorsal section of the brain. The branching esophageal nerves (en) originate from the ventral commissural tract (vct). The lateral medullary cords (mc) originate in the ventral part of the brain. The letters on the right (a–d) refer to the histological sections in figure 25 .