. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HARfO K.\\ATA XI AX I) U1ROKO SHIRAI. ow FIGURE 2. Maturation of oocytes within ovary brought about by nerve extract. (A) Sec- tion of ovarian fragment immersed for 1 hour in sea water (control), ()\V, ovarian wall; F, follicle. (B) Section of ovarian fragment immersed in sea water containing nerve extract for 1 hour. Note that oocytes are detached from the ovarian wall and undergoing first maturation division Follicles surrounding oocytes disappear. merits were detached from the ovarian wall and wen1 undergoing the first ma
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HARfO K.\\ATA XI AX I) U1ROKO SHIRAI. ow FIGURE 2. Maturation of oocytes within ovary brought about by nerve extract. (A) Sec- tion of ovarian fragment immersed for 1 hour in sea water (control), ()\V, ovarian wall; F, follicle. (B) Section of ovarian fragment immersed in sea water containing nerve extract for 1 hour. Note that oocytes are detached from the ovarian wall and undergoing first maturation division Follicles surrounding oocytes disappear. merits were detached from the ovarian wall and wen1 undergoing the first matura- tion division, whereas oocytes in control fragments kept in sea water alone for the same period were attached to the ovarian wall, and between them a follicular envelop was observed. Germinal vesicles of the control oocytes remained intact. These experiments showed that although contraction of the ovarian wall seemed to be essential for expelling the eggs from the ovary, there existed a marked dif- ference between the portions treated with nerve extract and the controls with respect to the readiness with which eggs were released. Further, when an ovarian alveolus was isolated from an ovary and its wall slit by fine forceps in sea water, the alevolar wall contracted suddenly, discharging a mass of eggs from the slit, and turning inside-out because of the presence of eggs adhering to its inner surface and to each other ( Fig. 3 ). Most of the eggs in isolated alveoli treated with nerve extract were freely discharged after a certain period even without a slit being made. From these results, it is concluded that the action of the neural substance re- sults in freeing the eggs from adherence to each other and to the inner surface of the goiiadal wall, by dissolving or rupturing the follicles. Spawning of ovarian fragments in sea icutcr lacking divalent cations Since bivalent cations such as calcium and magnesium are well known to stablixe intercellular cementing substances, th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
