Abstract
AbstractIn the pulmonate snail Melampus bidentatus, cerebral ganglia from adult donors implanted into the hemocoel of adult host snails form connections with the host nervous system and periphery. In addition, approximately 50% of the implanted ganglia develop an eye on the surface of the ganglion, and approximately 25% of the host snails develop a supernumerary tentacle above the site where the implanted ganglion lies. The morphology of these sensory structures was examined by light and electron microscopy. Comparison of implant eyes with adult control eyes and regenerated eyes indicates that the same elements are present (cornea, lens, microvillar layer, pigment layer and cell layer), although implant eyes at four months and regenerated eyes at two months do not have pigment and microvillar layers as thick as the controls. The receptor cell structure is similar in all cases. The surface of the supernumerary tentacles is not as convoluted as that of control tentacles, but sensory cells and a neural link to the implant ganglion are present. An eye is often produced in the skin at the base of the supernumerary tentacle.
Published Version
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