Cytology and Histology of the Cerebral Neurosecretory Systems in some Tropical Earthworm Species
Chaudhuri PS* and Dipanwita Banik
Department of Zoology, Earthworm Research Laboratory, Tripura University, Suryamaninagar-799022, Tripura, India
- *Corresponding Author:
- Chaudhuri PS
Department of Zoology
Earthworm Research Laboratory
Suryamaninagar-799022, Tripura, India
Tel: 0381 237 4802
E-mail: [email protected]
Received Date: July 16, 2015 Accepted Date: August 12, 2015 Published Date: August 15, 2015
Citation: Chaudhuri PS, Banik D (2015) Cytology and Histology of the Cerebral Neurosecretory Systems in some Tropical Earthworm Species. J Cytol Histol 6:367. doi:10.4172/2157-7099.1000367
Copyright: © 2015 Chaudhuri PS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The cerebral ganglia of tropical earthworms, Metaphire houlleti, Metaphire posthuma (Megascolecidae), Eutyphoeus gammiei (Octochaetidae) and Eudrilus eugeniae (Eudrilidae) revealed mainly two categories of neurosecretory cells (NSCs) – A cells and B cells. Thick cortical tier of A cells stained intensely with AF and were differentiated into A1, A2 and A3 types on the basis of their shape, size and location. The sub-cortical B cells, lying close to the neuropile stained lightly with AF. While the axons of A1 cells discharged neurosecretory material (NSM) beneath the perineurium, those of A2, A3 and B cells generally transported NSM at the margin of the neuropile forming “accumulation zone”. Our present study revealed that in earthworms, in absence of any well-defined neurohaemal organ, there was a phenomenal deposition of NSM in the “accumulation zone” or tissue spaces beneath the highly vascular perineurium from where the secretion readily entered the capillaries by diffusion to meet the physiological demand of the animal.