| Popis: |
MANY of the Annelids possess relatively large nerve fibres in their central nervous system, and those of the earthworm among the Oligochaetes, and of Halla, Arenicola, Clymenella and Axiothea among the Polychaetes, have been studied. The giant fibres in these forms arise either from a single nerve cell in the case of Halla1, or each fibre from numerous nerve cells in the case of the other forms mentioned2. According to several writers3, the single nerve fibre in the ventral nerve cord of the Sabellid, Myxicola infundibulum, is exceptionally large and we have, therefore, prepared serial sections of this species. |
