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THE CENTRAL NERVOUS SYSTEM OF MEDUSAF ExPERI
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able activity animal appear arms associative memory assume attempt becomes begins body brain called causes cells central nervous system centre cerebral hemispheres certain changes chapter character chemical comparative conclusion connected consciousness consider contains continue contraction co÷rdination crawl depend determined direction disturbances effects elements entirely exist experiments extirpation fact forced frog functions ganglia ganglion ganglion-cells head heliotropic higher influence innervation instance instincts irritability legs light longer means meat mechanism motions motor mouth move movements muscles nature necessary Nereis nerves normal observed occur operation oral organs orientation pass peripheral phenomena physiology piece plants position possess possible posterior processes produced progressive proved reactions reflex regard remains removed result seems segmental severed shown side simple soon spinal cord spontaneous stimulated structures substances surface tion true turn visual whole worms