ウニにおける卵・精子放出の圧力

概要

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Internal pressure of the gonad of the sea urchin, Hemicentrotus purcherrimus, was measured by means of the electric manometer, when shedding of the gametes was artificially induced. By application of acetylcholine to the gonad, gamete-shedding and preceding increase in theinternal pressure-both of temporaly nature-were detected. During AC stimulation of the gonad, shedding pressure was clearly demonstrated. Acetylcholine application, that after preliminary eserine treatment, or KCl application to the gonad always induced heavy and persisting shedding, and the pressure developed in these cases exceeded 10cm H_2O. Spontaneous shedding occasionally observed was accompanied by pulsatory high pressure, and shedding occured intermittently at each increasing phase of the pressure pulsations. These results suggest that the final step of shedding is pressing out of the gamates by active contraction of the muscle of the gonadal wall. At the same time, liquefaction of the interior of the gonad by these stimulations may facilitate the squeezing out of the gametes.
社団法人日本動物学会の論文
1976-09-25