Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ions of the nervous system are con-centrated around the cesophagus in the cephalothorax of the the small superoesophageal or cephalic bilobed mass are sentupwards the optic filaments, forwards the nerves of the forcipatedmandibles or chelicera, and, backwards, the stomato-gastric nerves ;the sub-oesophageal ganglionic columns distribute nerves to thegreat maxillary cheliform palpi, and to the four pairs of thoraciclegs: two slender continuations of the med
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ions of the nervous system are con-centrated around the cesophagus in the cephalothorax of the the small superoesophageal or cephalic bilobed mass are sentupwards the optic filaments, forwards the nerves of the forcipatedmandibles or chelicera, and, backwards, the stomato-gastric nerves ;the sub-oesophageal ganglionic columns distribute nerves to thegreat maxillary cheliform palpi, and to the four pairs of thoraciclegs: two slender continuations of the median columns are continuedalong the jointed abdomen or tail, and seven small ganglions aredeveloped upon them, from which and from the interganglionicchords nervous filaments are distributed to the surrounding parts. The ventral continuation of the anterior aorta, which lies looselyupon the dorsal aspect of the ganglionic chords, must be injected inorder that its branches, which accompany the nervous filaments, maybe distinguished from them. The vessel itself has been mistaken for * CCXXXr. p. 405. V, G 450 LECTUIIE a nerve, and lias been regarded by some as the motor, by others asthe respiratory tract. In spiders the central masses of the nervous system are wholly, orin great part, concentrated in the cephalothorax. The brain {Jig- \^Qoyand 166, c) is a bilobed ganglion, sending forwards and upwards theoptic nerves (o) from its anterior angles, and below these, the twolarge nerves (m) to the lesmandibles {m) : a shortand thick collar enclosesthe narrow gullet, andexpands into a secondvery considerable stel-late or radiated gan-glion (5), situated belowthe stomach upon the plastron: it sends off Nervous system, Mygale. five principal nerves on each side ; the first {p) to the pediformmaxillary palpi; the second (Z) to the more pediform labial palpi,which are usually longer than the rest of the legs and used bymany spiders rather as instruments of exploration than of locomo
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
