Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 4
... probably less worthy , constituent . I may now say a few words on the scope of the investigations which are to be described in the present treatise . To some extent this is conveyed by the title ; but I may observe that , as the " primi ...
... probably less worthy , constituent . I may now say a few words on the scope of the investigations which are to be described in the present treatise . To some extent this is conveyed by the title ; but I may observe that , as the " primi ...
Pagina 20
... probably stand in connection with epithelium - cells ; nerve - cells which pass into muscle- fibres , similar to those which Kleinenberg has called neuro - muscular cells ; and , in the tentacles , neuro - muscular cells joined with ...
... probably stand in connection with epithelium - cells ; nerve - cells which pass into muscle- fibres , similar to those which Kleinenberg has called neuro - muscular cells ; and , in the tentacles , neuro - muscular cells joined with ...
Pagina 25
... probably present . Lastly , another important distinction must be borne in mind - the distinction , namely , which is to be drawn between muscle and nerve . A stimulus applied to a nerveless muscle can only course through the muscle by ...
... probably present . Lastly , another important distinction must be borne in mind - the distinction , namely , which is to be drawn between muscle and nerve . A stimulus applied to a nerveless muscle can only course through the muscle by ...
Pagina 32
... probably be but short ; the nervous shock , if we may so term it , although evidently considerable at the time , soon passes away , and the animal resumes its motions as before . In the great majority of cases , however , the activity ...
... probably be but short ; the nervous shock , if we may so term it , although evidently considerable at the time , soon passes away , and the animal resumes its motions as before . In the great majority of cases , however , the activity ...
Pagina 33
... probably in all the other genera of the true Medusa ) locomotor centres are situated in every part of the extreme margin of a nectocalyx , but that there is a greater supply of such centres in the marginal bodies than elsewhere ...
... probably in all the other genera of the true Medusa ) locomotor centres are situated in every part of the extreme margin of a nectocalyx , but that there is a greater supply of such centres in the marginal bodies than elsewhere ...
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