Fine structural observations on spermatogenesis in a progenetic trematode, Bucephaloides Gracilescens
Flatworm nerve–muscle: structural and functional analysis
Platyhelminthes occupy a unique position in nerve–muscle evolution, being the most primitive of metazoan phyla. Essentially, their nervous system consists of an archaic brain and associated pairs o...
Fine structural observations on spermatogenesis inCorrigia vitta (Trematoda: Dicrocoeliidae)
Spermatogenesis and the fine structure of the spermatozoon in a dicrocoelid trematode,Corrigia vitta have been examined by light and electron microscopy. The testes are composed of two distinct cell…
Isolation, Localization, and Bioactivity of the FMRFamide‐Related Neuropeptides GYIRFamide and YIRFamide from the Marine Turbellarian Bdelloura candida
An important role is indicated for GYIRFamide and YirFamide in the control of neuromuscular function in turbellarians and the structure of the endogenous peptides was optimal for peak activity.
Vitelline cell development in monogenean parasites
Histochemical and electron microscopic studies of the vitellaria of three polyopisthocotylean fish-gill flukes, Diplozoon paradoxum, Diclidophora merlangi and Calicotyle kröyeri have shown that, in each case, viteLLine cell development is basically similar.
Development of the nervous system in Dugesia tigrina during regeneration after fission and decapitation
Results indicate that two processes are involved in the formation of the new cerebral ganglion of Dugesia tigrina, where 5-HT-IR cells appear before NPF- IR cells, in contrast to the pharynx where NPF/IR cells differentiate before the 5- HT/5-HT cells.
Basiepidermal nervous system in Nemertoderma westbladi (Nemertodermatida): GYIRFamide immunoreactivity.
Inhibitory effects of nematode FMRFamide-related peptides (FaRPs) on muscle strips fromAscaris suum
It is shown that the effects of PF1 were also dependent on external Ca++ and were reduced by the Ca++-channel blocker verapamil, observations consistent with the finding that nematode NOS is Ca++/Ca++-dependent.