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An Introduction to the Study of the Comparative Anatomy of Animals (Volume 2)

An Introduction to the Study of the Comparative Anatomy of Animals (Volume 2)


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER XVIII THE EARTHWORM -continued The earthworm is hermaphrodite (moncecious), being furnished with two pairs of testes and one pair of ovaries, together with accessory generative organs, which will now be described. The ovaries are a pair of small pear-shaped bodies lying in somite 13. They are attached by their broader ends to the hinder face of the septum separating the I2th from the 13th somite, and lie low down in the body-cavity not far from the ventral nerve cord. Essentially an ovary arises as a local multiplication of cells of the ccelomic epithelium. Its thicker end consists of a solid mass of cells or oogonia, and the narrower end contains ripe ova, the intermediate part being occupied by ova in different stages of maturation. The mature ovum is surrounded by a distinct follicle consisting of a single layer of flattened cells. On the bursting of the follicle, the ovum, which is a large round cell with granular cytoplasm and a very distinct nucleus and nucleolus, passes into the cavity of the somite and is thence conducted to the exterior by a special oviduct. There is a pair of oviducts opening into segment 13 by wide ciliated funnel-shaped mouths. Each duct passes through the septum separating segments 13 and 14, dilates on the other side of it to form a small chamber, the receptaculum ovorum or ovisac, and turns sharply outwards and downwards to open to the exterior by the oviducal pore on segment 14. The ova remain for some time in the ovisac before they pass to the exterior, and in it they undergo the final phases of maturation. The two pairs of testes are small digitate organs situated in somites To and u, in positions exactly corresponding with those of the ovaries. Like the ovaries, they are local thickenings of the ccelomic epithelium, but the sperm ...


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Product Details
  • ISBN-13: 9780217173346
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 152 mm
  • No of Pages: 184
  • Spine Width: 11 mm
  • Width: 229 mm
  • ISBN-10: 0217173349
  • Publisher Date: 14 Oct 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 277 gr


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