THE ORIGIN OF THE NERVOUS SYSTEM INPENNARIA TIARELLA, AS REVEALED BY TREATMENT WITH COLCHICINE
Open Access
- 1 April 1981
- journal article
- research article
- Published by University of Chicago Press in The Biological Bulletin
- Vol. 160 (2) , 303-310
- https://doi.org/10.2307/1540890
Abstract
Treatment of 8-h embryos of the marine hydrozoan P. tiarella with colchicine for 2 h eliminates interstitial cells, nematoblasts and ganglionic cells. Comparisons of interstitial-cell-less and control planulae of Pennaria by transmission electron microscopy and light microscopy suggest a dual origin of the nervous system in Pennaria. Ganglionic cells are derived exclusively from endodermally-derived interstitial cells; neurosensory cells are derived from cells of the ectodermal epithelium, probably from the epitheliomuscle cells. This investigation supports the idea that ganglionic cells and neurosensory cells can differentiate not only from different stem cells but also from different germ layers.This publication has 0 references indexed in Scilit: