Neurohistology and Neurocytology

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NEURONAL DIVERSITY
- Categories of neurons of CNS:
1. Afferent/ sensory neurons – convey information from periphery to CNS 2. Motor- sends commands to muscles and glands
3. Interneurons – most abundant signalling elements in the CNS ( process information locally or convey information from one region of CNS to another • Types:
a. Local interneurons/ internuncial neurons/ local circuit neurons – short axon Golgi type II (greatly outnumber type I in CNS) b. Relay/ principla/ projection neurons – long axon Golgi type I - Wide variation in size and infinite variety in arrangement of processes of neurons but similar structure when located in a given region |Bipolar neurons |Unipolar neurons |Multipolar neurons | |transmit impulses generated by olfactory, visual, |Convey impulses from variety of specialized and |Transmit both sensory and motor nerve impulses | |vestibular, and auditory receptor endings ( sensory in|nonspecialized receptors | | |function | | | | |characteristic of spinal ganglia and mesencephalic |Characteristic of brain, spinal cord, and peripheral | | |nucleus of trigeminal nerve |ANS | | | |e.g. Purkinje cell of cerebellar cortex | | |Aka pseudounipolar – develop from bipolar neurons ( |Primary, secondary, tertiary dendritic processes may | | |initial portion of two processes approximate and |be elaborate and enormously increase its synaptic | | |eventually fuse |surface |

|Profuse dendritic branches of Central sensory and integrating neurons |Robust Dendrites of motor neurons | |Inferior olivary complex ( Radiating dendrites with curly branches |Small cell of reticular formation | |Granule cell of cerebellar cortex |Large cell of reticular formation | |Small gelatinosa cell of the spinal trigeminal nucleus ( few large dendrites that|Cell from globus pallidus | |issue chiefly from one side of the cell ( smaller branches form a compact zone of|Nucleus ambiguus neuron | |fine parallel fibers |Neuron of hypoglossal motor nucleus | |Ovoid cell of nucleus of tractus solitaries |Anterior horn cell | |Spindle shaped cell of substantia gelatinosa of spinal cord | | |Large cell of spinal trigeminal nucleus | | |Neuron of putamen |...
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