MaleProcFIG 12A & B: Proctodeum-associated muscle groups.
A. Diagrams illustrating the location of the muscles associated with the proctodeum. B. Low-power TEM showing the location of the spicule protractor muscles and the gubernaculum within the proctodeum, transverse view. Regions marked by white squares depicted in MaleProcFIG 12C&D, respectively. (Image source: N2Y [MRC] 45.)