MaleMusFIG 25: Ultrastructure of the spicule retractors.

A. Low-power TEM featuring the gap junctions coupling the dorsal and ventral retractor muscles, transverse section. (PAG) Pre-anal ganglion; (v/dBWM) ventral and dorsal body wall muscle; (v/dsrL/R) ventral and dorsal spicule retractors,(v/dspL) ventral and dorsal spicule protractors. (Image source: N2Y [MRC] 575-24.)
B. TEM of boxed area in 25A showing close up of the gap junction between the dorsal and ventral spicule retractor. (hyp) Hypodermis; (Bl) basal lamina. (Image source: N2Y [MRC] 6824-24.)
C. TEM showing close up of the gap junction between the dorsal spicule retractor and dorsal body wall muscle. (Image source: N2Y [MRC] 686-12.)