part_of part of part of contained in existence overlaps material entity anterior region of the whole animal dorsal region of the whole animal posterior region of the whole animal ventral region of the whole animal juvenile stage head region prepharyngeal region parapharyngeal region tail region subepidermal nerve plexus PMID:27612384 doi:10.1002/jmor.1051550208 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 Plexus of nerves located just between the epidermis and the body wall musculature. Planarian_Anatomy nerve plexus adult hermaphrodite asexual adult copulatory region integumental system