Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 27
... after removal of the entire margin , three centres of spontaneity were found to remain in the sheet of contractile tissue lining the nectocalyx . of the muscular system , there being no subsequent movements FUNDAMENTAL EXPERIMENTS . 27.
... after removal of the entire margin , three centres of spontaneity were found to remain in the sheet of contractile tissue lining the nectocalyx . of the muscular system , there being no subsequent movements FUNDAMENTAL EXPERIMENTS . 27.
Pagina 28
... spontaneity , having at least for one of its functions the origination of impulses , to which the contractions of the nectocalyx , under ordinary circumstances , are exclusively due . And this obvious deduction is confirmed ( if it can ...
... spontaneity , having at least for one of its functions the origination of impulses , to which the contractions of the nectocalyx , under ordinary circumstances , are exclusively due . And this obvious deduction is confirmed ( if it can ...
Pagina 31
... spontaneity being in the smallest degree affected . Effects of excising Certain Portions of the Margins of Nectocalyces . The next question which naturally presents itself is as to whether the locomotor centres are equally distributed ...
... spontaneity being in the smallest degree affected . Effects of excising Certain Portions of the Margins of Nectocalyces . The next question which naturally presents itself is as to whether the locomotor centres are equally distributed ...
Pagina 35
... spontaneity is the margin , but that the latter is not , as in the naked- eyed Medusa , the exclusive seat of spontaneity . Although in the vast majority of cases I have found that excision of the margin impairs or destroys the spontaneity ...
... spontaneity is the margin , but that the latter is not , as in the naked- eyed Medusa , the exclusive seat of spontaneity . Although in the vast majority of cases I have found that excision of the margin impairs or destroys the spontaneity ...
Pagina 37
... spontaneity removed , may be made to progress by a succession of con- tractions round and round the vessel in which it is contained , just as a frog , with its cerebral hemi- spheres removed , may be made to hop along the table in ...
... spontaneity removed , may be made to progress by a succession of con- tractions round and round the vessel in which it is contained , just as a frog , with its cerebral hemi- spheres removed , may be made to hop along the table in ...
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