Excretory System Stage 2

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“Development of excretory system of vertebrate. The pronephros is completely separated off from the primitive segment and lateral plate. n.c., nerve cord; nch., notochord; pn., pronephros; g., gut; p.s., primitive segment; mes., mesonephric tubule; pn.d., pronephric duct; b.c., body cavity; ao., aorta; siv., sub-intestinal vein, with vessel to the aorta.” -Thomson, 1916

Source

J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)

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