Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 4
... described in the present treatise . To some extent this is conveyed by the title ; but I may observe that , as the " primi- tive nervous systems " whose physiology I have sought to advance are mainly subservient to the office of ...
... described in the present treatise . To some extent this is conveyed by the title ; but I may observe that , as the " primi- tive nervous systems " whose physiology I have sought to advance are mainly subservient to the office of ...
Pagina 14
... described the nervous elements as forming a continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH ...
... described the nervous elements as forming a continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH ...
Pagina 17
... described by Professor Haeckel . In all species the upper nerve - ring lies entirely in the ectoderm . Its principal mass is composed of nerve- fibres of wonderful tenuity , among which are to be found sparsely scattered ganglion ...
... described by Professor Haeckel . In all species the upper nerve - ring lies entirely in the ectoderm . Its principal mass is composed of nerve- fibres of wonderful tenuity , among which are to be found sparsely scattered ganglion ...
Pagina 18
... described . Beneath the upper nerve - ring lies the lower nerve - ring . It is inserted between the muscle- tissue of the veil and umbrella , in the midst of a broad strand wherein muscle - fibres are entirely absent . It here ...
... described . Beneath the upper nerve - ring lies the lower nerve - ring . It is inserted between the muscle- tissue of the veil and umbrella , in the midst of a broad strand wherein muscle - fibres are entirely absent . It here ...
Pagina 20
... described several peculiar tissue elements , such as , in the umbrella , nerve- fibres which probably stand in connection with epithelium - cells ; nerve - cells which pass into muscle- fibres , similar to those which Kleinenberg has ...
... described several peculiar tissue elements , such as , in the umbrella , nerve- fibres which probably stand in connection with epithelium - cells ; nerve - cells which pass into muscle- fibres , similar to those which Kleinenberg has ...
Termeni și expresii frecvente
able ambulacral feet artificial rhythm Aurelia aurita become bell blocked brium cause ceased chloroform co-ordination continue contractile strip contractile tissue contraction contraction-waves covered-eyed Medusa crawling curare diastole direction discharge Echinoderm Echinodermata Echinus effect excising excitable tissues experiments fact feeble fibres forceps fresh water function ganglionic glycerine hour Illustrations induction shocks influence instance intervals irritability jelly-fish latter lithocyst locomotor centres manubrium marginal bodies marginal ganglia minutes movements muscle muscular mutilated naked-eyed Medusa natural rhythm nectocalyx nerve nerve-cells nerve-centre nerve-fibres nerve-ring nerve-trunks nervous network nervous system normal sea-water observed occur organ paralyzed pass pedicellariæ pedicels period of latent physiological plexus poison portion prepotent Professor pulsations radial tubes rays reflex reflex action removed response Sarsia seconds segments spasm species specimens spines spontaneity Star-fish strychnia suckers surface swimming motions swimming-bell systole tank temperature tentacles tentacular tetanus Tiaropsis indicans tion umbrella unmutilated animal wave whole