Morphological and functional identifications of catfish retinal neurons. I. Classical morphology.

摘要: The morphology of the catfish horizontal cells is comparable to that in other fish retinas. external contact cone receptors and are stellate shape; intermediate even more so rod receptors. internal constitute most proximal layer inner nuclear may possibly be, reality, extended processes from two cell types. Bipolar resemble those teleost retinas: size shape their dendritic tree encompass a continuous spectrum ranging what known as small large bipolar cells. accepted definition amacrine sufficiently vague justify our originating descriptive less inferential name for (axonless) neurons which radiate throughout synaptic layer. These starbust spaghetti vary considerably character extent spread, but correlates exist vertebrate Ganglion found not only classical ganglion displaced into well. Several types can be distinguished on basis geometry by properties tree. Not all categorization corresponds with previous descriptions; findings suggest some reorganization necessary classification areas retina. A subtle yet remarkable pattern underlies entire structure retina; there exists definite gradient within particular class cells, configuration among subclasses specific type. It remains seen if these morphological spectra bear any functional consequences. fact retina closely resembles phylogenetically ancient animals, such skate dogfish shark, testifies its primitive organization; mechanisms discernible this simple system may, therefore, applicable retinas higher ordered vertebrates.