. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PARSONS : NERVOUS SYSTEM OF GELASTOCORIS 179 are continuous with the frontal nerves and the frontal ganglion pass ventral to the gut forming the free frontal commissure (FC ; Figs. 2, 5, 23). From the anterodorsal part of the ganglion the nervus procurrens (; Figs. 2, 3, 5, 23) extends forward along the midline, above the food pump; it innervates the cibarial dilator muscles of the pump, Mm. dilatatores cibarii primus, secundus, tertius, et quartus {Hli, H15, H16, H17; Fig. 6). The nervus recurrent (; Figs. 3,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PARSONS : NERVOUS SYSTEM OF GELASTOCORIS 179 are continuous with the frontal nerves and the frontal ganglion pass ventral to the gut forming the free frontal commissure (FC ; Figs. 2, 5, 23). From the anterodorsal part of the ganglion the nervus procurrens (; Figs. 2, 3, 5, 23) extends forward along the midline, above the food pump; it innervates the cibarial dilator muscles of the pump, Mm. dilatatores cibarii primus, secundus, tertius, et quartus {Hli, H15, H16, H17; Fig. 6). The nervus recurrent (; Figs. 3, 19C) runs caudally from the posterior part of the frontal ganglion and passes between the brain and the subesophageal ganglion, dorsal to the gut. The anterior part of the recurrent nerve gives off fine branches to the GF LHI7A HI7 Fig. 23. Transverse section through the gut of an adult gelastocorid, taken at the level of the frontal ganglion, the procurrent nerve, and the frontal commissure. 255 X. pharyngeal dilator muscle of the food pump, M. dilator prae- pkaryngis (II17A; Fig. 6). Just before emerging posterior to the brain, the nerve becomes quite flat and broad, and gives off a very fine lateral branch on either side (Fig. 3) ; these two branches, as will be described later, join the nervi corporium cardiacorum primi from the corpora cardiaca. The flattened, broad part of the recurrent nerve ends as the hypocerebral gang- lion (GH; Fig. 3) just anterior to the corpus allatum, between the dorsal postpharyngeal dilator muscles. This ganglion does not appear to be associated with either the corpus allatum or the corpora cardiaca. Nabert (1913) observed "Brueken" be- tween it and the corpora cardiaca of Pyrrhocoris, and Bickley (1942) has reported the presence of a nerve plexus between the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustratio
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