"wall" articule at least 301+ Lunicular strands muscle. muscle What is tentacle sheath attached to??? From where do muscles arise. Networks lunicular strands going through lateral & transverse walls to form a reticulum throughout the colony. Does tentacle sheath line operculum? Where colonies abut they only grow together if differentiation cells have not yet begun blue lunicular strands linking onto tentacle sheath & operculum. Also from operculum across to wall. Penetrate tentacle sheath - diaphragm.