MaleProcFIG 12C&D: Proctodeum-associated muscle groups.

MaleProcFIG 12C & D: Proctodeum-associated muscle groups.

C. TEM, transverse view of spicule channel with surrounding muscles. (Image source: N2Z [MRC] 913-17.) D. TEM, transverse view highlighting the cloacal lumen and surrounding tissues. (Image source: N2Z [MRC] 913-17.) For lower magnification version of picture see MaleProcFIG12A&B.