Microphotography color of a nematode (Heterodera Glycines), parasite of the soybean plant (Glycine max).
Nematode worms are round, have the body elongated, cylindrical non-segmented and with bilateral symmetry. Often, the male has a curved rear end with a helical or spicules copulatorias and, in some species, a bag called the caudal bursa. The forward end of the adult may have crocheted oral teeth or plates in the buccal capsule, which serve for the binding to tissues, and small body surface projections known as papillae or bristles, which are believed to be sensitive in nature. They are called anfidios, fasmidios or deiridios the second portion of the body where they are located.
The outer surface of the adult worm is very strong and is called the cuticle composition escleroproteica usually smooth, although some species with striations or ridges cuticule. Are under the cuticle and muscle layers of a composite liquid that functions as a hydrostatic skeleton called pseudocele which promotes the distribution of nutrients and the collection of excretory products and which also are the gonads. All the organs’ float ‘within this liquid. The systems of internal organs consist of a complex nervous cordon (nodes connected around the esophagus) and a well-developed digestive system with buccal capsule (where the aforementioned hooks, teeth, plates or buds), esophagus, intestine and anus. They have no circulatory system, so as to move the liquid must move the internal body to hydrostatic pressure. Different species vary in size from a few millimeters (eg Strongyloides stercoralis to over a meter (Dracunculus medinensis for example), and even more.
|Histochemically demonstrable enzymes in the organs of the digestive system of the newborn rat (Progress in histochemistry and cytochemistry) by Ruth E Shrader (Hardcover – 1972)
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