Observations on the ultrastructure of a cephalic sense organ of the nematode Mermis nigrescens



This cephalic sense organ of Mermis nigrescens is unusual in that it is innervated by a dendrite which ends in two dendritic processes. These dendritic processes contain numerous neurotubules. There is a basal plate at the base of the dendritic process, and this is associated with a well-developed system of striated fibres which extend into the cytoplasm of the dendrite.