part_of part of part of contained in develops_from develops from existence overlaps existence starts during or after existence ends during or before material entity anatomical entity anatomical entity Stage 2 Stage 3 Stage 4 Stage 5 Stage 6 embryonic pharynx An innervated, muscular pump that ingests yolk cells into the gut cavity. The embryonic pharynx is an extraembryonic tissue that forms during Stage 2, functions during Stages 3-5, and degenerates during Stages 6-7. Planarian_Anatomy temporary embryonic pharynx PMID:28072387 ISBN:9780070316607 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4552 embryonic digestive system oral hemisphere extraembryonic organ blastomere