. Biology and man. Biology; Human beings. How Does Sexual Reproduction Take Place in Vertebrates? Vertebrate Reproduction' In backboned animals the reproductive or germ cells are borne in special organs called gonads, and they are usually pro- duced in two different individuals. The gonads are generally paired organs located in the hind part of the abdomen. The eggs, or ova, are formed in the ovary diVid are discharged into the general body cavity. They then pass through a long twisted egg-tube, or ow-duct, eventually reaching the exterior. The sperms are produced in spermaries, or testes, and
. Biology and man. Biology; Human beings. How Does Sexual Reproduction Take Place in Vertebrates? Vertebrate Reproduction' In backboned animals the reproductive or germ cells are borne in special organs called gonads, and they are usually pro- duced in two different individuals. The gonads are generally paired organs located in the hind part of the abdomen. The eggs, or ova, are formed in the ovary diVid are discharged into the general body cavity. They then pass through a long twisted egg-tube, or ow-duct, eventually reaching the exterior. The sperms are produced in spermaries, or testes, and are discharged to the exterior by way of special ducts (see illustration, p. 379). In fishes that we commonly use as food we can often find the ovaries with their masses of eggs, or "roe", in the female specimens, and the corresponding spermaries, or "milt", in male specimens. In the other classes of backboned animals (rep- tiles, amphibians, birds, mammals), the essential organs are the same. The distinctive variations are related to the manner in which the eggs and sperms Mature plant Section of conceptacle with egg organs and sperm organs. Egg surroxinded by sperms REPRODUCTION IN ROCKWEED, OR BLADDER WRACK The eggs and sperms of the bladder wrack are discharged into the water. Numerous sperms swarm around a single egg until one sperm unites with it. The result of the union is a fertilized egg, or zygote ^See No. 6, p. 395. 377. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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