. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 314 Sid Staubach & Annette Klussmann-Kolb: Cephalic sensory organ in Aceton. Fig. 2. A. Lateral SEM photography of the groove at the ventral surface of the cephalic shield of Acteon tomatilis. cs cephalic shield, gr groove. B. Frontal SEM photography of the mouth region oí Acteon tomatilis. cs - cephalic shield, mo - mouth, f- foot. 4. DISCUSSION The present study demonstrates the constancy of nervous structures in the opisthobranch tnoUusc. Throughout our inves
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 314 Sid Staubach & Annette Klussmann-Kolb: Cephalic sensory organ in Aceton. Fig. 2. A. Lateral SEM photography of the groove at the ventral surface of the cephalic shield of Acteon tomatilis. cs cephalic shield, gr groove. B. Frontal SEM photography of the mouth region oí Acteon tomatilis. cs - cephalic shield, mo - mouth, f- foot. 4. DISCUSSION The present study demonstrates the constancy of nervous structures in the opisthobranch tnoUusc. Throughout our investigation of several individuals of the í\c{QO\\\á, Acteoi) tomatilis we found uniform innervation pattems of the head region via four cerebral nerves, which can be attrib- uted to characteristic neuronal cell clusters in the CNS. These cellular innervation patterns in A. torinitilis show an extremely high congruence with the cellular innerva- tion patterns described for the four cerebral nerves of Haiiiiiioeu hychitis (Staubach et al. in press). in the Nl, the number of cerebral clusters as well as the position of these clusters to each other is the same in A. tofiiatilis and H. hydatis. However, we found some dif- ferences in the size and number of somata when compar- ing both species. Additionally, we could not detect a pleu- ral, a parietal and a pedal cluster in A. toniatilis. which were described for H. hydatis. This may be due to the dif- ferences in the peripheral innervation area of the Nl. In A. toriiatilis it only provides for the lip and very small parts of the median cephalic shield whereas in H. hydatis. it in- nervates the lip and large parts of the anterior cephalic shield. For the second nerve, the N2 (Nervus labialis), we nearly fotmd no differences between the presence and dis- tributions of the cell clusters for both species. The only ostentatious difference was the lack of a single pedal so- ma and its contra-lateral analogue in A. toriiatilis. In the Nc
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