Neurohistology and Neurocytology

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