anterior to posterior to contained in existence overlaps material entity anatomical region anterior region of the whole animal juvenile stage head region prepharyngeal region PMID:21295481 PMID:24120894 pre-pharynx region PMID:27150006 PMID:22339734 PMID:28287248 PMID:17251262 PMID:29674431 PMID:29547123 OCLC:16809160 PMID:23318641 PMID:27063937 PMID:18202849 PMID:26556349 https://doi.org/10.1101/279364 PMID:28216315 PMID:28893948 PMID:18287199 PMID:24922054 Planarian_Anatomy https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 pre-pharyngeal region PMID:28245923 neck Region of the juvenile or adult animal between the posterior end of the cephalic ganglia and the anterior end of the pharynx. PMID:21852957 parapharyngeal region adult hermaphrodite asexual adult