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| Histological Observation of Digestive and Nervous Systems in Water Fleas Tisbe f urcata Baird |
| BAI Xue-feng,LI Hai-dong,SUN Hu-shan |
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Abstract The digestive and nervous systems were studied in water fleas Tisbe f urcata Baird by histologi-cal method .The digestive system consisted of esophagus ,caecus ,midgut ,and hindgut lining with inner epithelial layer and outer muscle layer .There were secretory cells ,which secrete digestive enzymes ,in the epithelia of the caecus and midgut as a main function area of absorption and digestion .The nervous system comprised of brain cord ,whose nerve cells were primarily distributed above the brain ,ethnic distribution in the brain around ,and ventral nerve cord .Cranial nerve formed circumoesophageal ring in the esopha-gus ,and the ventral nerve cord contained two incomplete coalescence of nerve fibers and nerve cells .Nerve fibers taper and the nerve cells were gradually reduced from chest to abdomen in number .Neurons were found bigger in the brain than in ventral nerve cord .
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Received: 25 September 2014
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