primary gut branch primary intestine branch PMID:20865784 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 Planarian_Anatomy PMID:17553481 PMID:27122174 PMID:29674431 main gut branch The largest branch of the triclad intestine. It is comprised of the gastrodermis, a columnar epithelium, surrounded by basal lamina and visceral musculature. PMID:21664348 PMID:28137894 gut branch