Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 MULLERI 229 second to fifth and then runs downwards with the outer group of sixth to eighth dorsal longitudinal muscles in the afferent channel of the pericardium. Just below the point where the three outer muscles twist over each other (p. 215) the nerve divides into two branches, one continuing downwards as the posterior cardiac nerve in the afferent channel and the other passing through the pericardial floor close against its anterior attachment to the body wall. The latter I call the anterior card
Discovery reports (1940) Discovery reports discoveryreports19inst Year: 1940 MULLERI 229 second to fifth and then runs downwards with the outer group of sixth to eighth dorsal longitudinal muscles in the afferent channel of the pericardium. Just below the point where the three outer muscles twist over each other (p. 215) the nerve divides into two branches, one continuing downwards as the posterior cardiac nerve in the afferent channel and the other passing through the pericardial floor close against its anterior attachment to the body wall. The latter I call the anterior cardiac nerve. It runs downwards towards the adductor tendon and receives a branch from the shell near the Fig. 15. Drawing of a thick section passing through the single cardiac neurone and the pair of hepatic valves, cardiac neurone; efferent cardiac nerve; hepatic valves; pc. pericardium; peri- cardial dilator. bottom of the isthmus, the fourth shell nerve. It then runs as the combined anterior cardiac + shell nerve IV down the tendon of the dorso-ventral body retractor muscle (Figs. 6, 14) to loop under the adductor tendon and enter the nerve ring on the dorsal side of the maxillulary group (Fig. 11). The anterior cardiac portion, as it passes down- wards, gives off small branches which can be traced to their nerve endings on muscles 4, 5, 11 and 10 (Fig. 9). The posterior cardiac nerve continues down the afferent channel to a point near the lower ends of the outer dorsal longitudinal muscles. Here it receives a large nerve from the dorsal body wall—the pericardiac nerve. This I have traced spreading out over
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