Cyto-topographycal studies on the central nervous system of Lymnaea stagnalis L.

Gubicza, András (1970) Cyto-topographycal studies on the central nervous system of Lymnaea stagnalis L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 37. pp. 3-15. ISSN 0365-3005

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Abstract

From the results of cyto-topographic investigations performed on the central nervous system of Lymnaea stagnalis L. it was concluded that 1. The central nervous system of medium-sized specimens of Lymnaea stagnalis L. (weighing 14-16 g) contains about 13000-16000 neurons. 2. The pedal ganglion contains the highest and the buccal ganglion the lowest number of nerve cells. 3. The number of neurons in the right and left buccal, cerebral and pedal ganglia is nearly identic, whereas the right pleural ganglion in all the specimens examined contained more nerve cells than the left one. In the right parietal ganglion the number of neurons was three times higher than in the left. 4. Most nerve cells exceeding 100 у in diameter are comprised in the right parietal and the abdominal ganglia. No cells over 200 у in diameter were found in the buccal, pleural and pedal paired ganglia. 5. In the distribution of large cells (over 100 у in diameter) the following regularity was noted: The majority of large cells are located in the caudal part (zone I) of the buccal and cerebral ganglia and in oral part (zone III) of the left parietal ganglion. In the other ganglia the number of large cells is nearly identic in all three zones. 6. On the basis of the anatomical and histological structure of the right parietal ganglion, cell number and distribution of large cells within it, and according to the data of earlier works, this ganglion should be regarded as one arisen from the fusion of the right parietal and right abdominal ganglia. Therefore, the term “parieto-abdominal ganglion” is suggested.

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