Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 11
... fibres , and its thickness , which is pretty uniform , is nowhere greater than that of very thin paper . The manubrium is the mouth and stomach of the animal , and at the point where it is attached to or suspended from the umbrella its ...
... fibres , and its thickness , which is pretty uniform , is nowhere greater than that of very thin paper . The manubrium is the mouth and stomach of the animal , and at the point where it is attached to or suspended from the umbrella its ...
Pagina 15
... nerve ; so that in Haeckel's researches on Geryonia , whereby both true ganglion - cells and true nerve- fibres were first demonstrated as occurring in the Medusa , we have a most important step in the STRUCTURE OF THE MEDUSE . 15.
... nerve ; so that in Haeckel's researches on Geryonia , whereby both true ganglion - cells and true nerve- fibres were first demonstrated as occurring in the Medusa , we have a most important step in the STRUCTURE OF THE MEDUSE . 15.
Pagina 17
... fibres at the insertion of the veil gives rise to a considerable concentration of nervous structures ; while in ... fibres of wonderful tenuity , among which are to be found sparsely scattered ganglion - cells . The latter are for the ...
... fibres at the insertion of the veil gives rise to a considerable concentration of nervous structures ; while in ... fibres of wonderful tenuity , among which are to be found sparsely scattered ganglion - cells . The latter are for the ...
Pagina 18
... fibres are entirely absent . It here constitutes a thin though broad layer which , like the upper nerve - ring , belongs to the ectoderm . It also consists of the same elements as the upper nerve - ring , viz . of nerve - fibres and ...
... fibres are entirely absent . It here constitutes a thin though broad layer which , like the upper nerve - ring , belongs to the ectoderm . It also consists of the same elements as the upper nerve - ring , viz . of nerve - fibres and ...
Pagina 19
... fibres , but also by the relation in which these elements stand to the epithelium . For in the case of the lower nerve- ring , the presumably primitive connections of the nervous elements with the epithelium is well - nigh dissolved ...
... fibres , but also by the relation in which these elements stand to the epithelium . For in the case of the lower nerve- ring , the presumably primitive connections of the nervous elements with the epithelium is well - nigh dissolved ...
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