only excitatory cell in the cerebellum? - proteus
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only excitatory cell in the cerebellum? - proteus
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01-21-2008, 10:43 PM
The cerebellum constitutes only 10 percent of brain mass but accounts for approximately 50 percent of the neurons in the brain. Which of the following is the only excitatory cell in the cerebellum?
A. Basket cells B. Stellate cells C. Granule cells D. Purkinje cells E. Golgi cells
01-23-2008, 10:48 PM
the granule cell is the only excitatory neuron within the cerebellar cortex the NT is glutamate..all the others including purkinje ,golgi,basket and stellate cells are inhibitory(GABA).
the axon of granule cell terminates in purkinje cells(the target)
01-24-2008, 05:28 AM
Choice © is the correct answer. Granule cells are found in the innermost granular layer of the cerebellum. Axons of granule cells travel long lengths and are known as parallel fibers. Parallel fibers form excitatory synapses with Purkinje cells. Basket cells (Choice A) are inhibitory cells found in the outermost molecular layer of the cerebellum. Stellate cells (Choice B) are inhibitory cells found in the molecular layer of the cerebellum. Purkinje cells (Choice D) are inhibitory cells and are the primary output cell of the cerebellum. A single Purkinje cell may receive input from hundreds of thousands of parallel fibers. Golgi cells (Choice E) are inhibitory interneurons found in the granular layer of the cerebellum.
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