MaleMusFIG 37: Gubernacular retractor muscles.

A. Low-power TEM featuring the location gubernacular retractor muscles and their ventral attachment to the gubernacular and proctodeal epithelium. (BWM) Body wall muscle; (gecL/R) gubernacular erectors; (grtL/R) gubernacular retractors; (adp) anal depressor. (Image source: N2Y [MRC] 597-5.)
B. TEM of boxed area in 37A showing close up of the hemidesmosomes (red arrows) in this region. (Image source: N2Y [MRC] 581-1.)