. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON MOLLUSKS 129. quantity of the spontaneous progressive movements. Destruction of the pedal ganglion, on the other hand, puts an end to all locomotion. Steiner concludes, therefore, that " the pedal ganglion alone has control of the entire locomotion of the ani- ; This anthropo- morphic conclusion goes too far. The only conclusion we are justi- fied in drawing from this observation is, that the protoplasmic con- necting fibres between the skin and the foot- muscle of th
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON MOLLUSKS 129. quantity of the spontaneous progressive movements. Destruction of the pedal ganglion, on the other hand, puts an end to all locomotion. Steiner concludes, therefore, that " the pedal ganglion alone has control of the entire locomotion of the ani- ; This anthropo- morphic conclusion goes too far. The only conclusion we are justi- fied in drawing from this observation is, that the protoplasmic con- necting fibres between the skin and the foot- muscle of the animal pass through the gan- glion. Steiner further attempted to see if he could produce circus-motions by means of a one-sided divi- sion of the oesophageal commissure in other Mollusks, Pleurobranchia and Aplysia. He succeeded no better than in Pterotrachea. One-sidecl destruction of the pedal ganglion in Cymbulia, however, caused paralysis of one-half of the locomotor or^an. The animal o naturally moved in a circle, for only one wing served as an oar. The Cephalopods have an extremely complicated brain (Fig. 34). It consists of a dorsal and a ventral mass, each of which is composed of several ganglia. FIG. 34. BRAIN OF SEPIA. Cg; cerebral ganglion ; S/>g, supraoesophageal ganglion ; Bg; buccal ganglion ; Tg; ganglia of the tentacles. (After Claus.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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