Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 8
... centre attains to some such degree of complexity and elaboration as are to be met with in the brain . Whether or not there is a dawning consciousness in any nerve - centres con- siderably lower in the scale of nervous evolution , is a ...
... centre attains to some such degree of complexity and elaboration as are to be met with in the brain . Whether or not there is a dawning consciousness in any nerve - centres con- siderably lower in the scale of nervous evolution , is a ...
Pagina 8
... centre attains to some such degree of complexity and elaboration as are to be met with in the brain . Whether or not there is a dawning consciousness in any nerve - centres con- siderably lower in the scale of nervous evolution , is a ...
... centre attains to some such degree of complexity and elaboration as are to be met with in the brain . Whether or not there is a dawning consciousness in any nerve - centres con- siderably lower in the scale of nervous evolution , is a ...
Pagina 9
... the elaboration of nerve- centres throughout the animal kingdom is more fully considered in my work on " Mental Evolution in Animals " ( Kegan Paul , Trench & Co .: 1883 ) . CHAPTER I. STRUCTURE OF THE MEDUSE . To give a INTRODUCTION .
... the elaboration of nerve- centres throughout the animal kingdom is more fully considered in my work on " Mental Evolution in Animals " ( Kegan Paul , Trench & Co .: 1883 ) . CHAPTER I. STRUCTURE OF THE MEDUSE . To give a INTRODUCTION .
Pagina 20
... centres which are not connected by any commissures . These nerve - centres are situated in the margin of the umbrella , and are generally eight in number , more rarely twelve , and in some species sixteen . They are thickenings of the ...
... centres which are not connected by any commissures . These nerve - centres are situated in the margin of the umbrella , and are generally eight in number , more rarely twelve , and in some species sixteen . They are thickenings of the ...
Pagina 21
... centres of the covered - eyed Medusa there are no true ganglion - cells , or only very few ; that the mass of the central nervous system is very small ; and that the centralization of the nervous system is less complete in the one group ...
... centres of the covered - eyed Medusa there are no true ganglion - cells , or only very few ; that the mass of the central nervous system is very small ; and that the centralization of the nervous system is less complete in the one group ...
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