Illustrations. Fig. 4. Gray, Henry. 1918. Anatomy of the Human Body.

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Henry Gray (1825–1861). Anatomy of the Human Body. 1918.

FIG. 4

Formation of polar bodies in Asterias glacialis. (Slightly modified from Hertwig.) In I the polar spindle (sp) has advanced to the surface of the egg. In II a small elevation (pb¹) is formed which receives half of the spindle. In III the elevation is constricted off, forming the first polar body (pb¹), and a second spindle is formed. In IV is seen a second elevation which in V has been constricted off as the second polar body (pb²). Out of the remainder of the spindle (f.pn in VI) the female pronucleus is developed.

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