In classical descriptions of the olfactory bulb 3 distinct types of cells have been recognized in the deeper layers: the mitral, granule, and short axon cells ( Cajal, 1911). ![]() Their cell bodies can also be distinguished with the electron microscope, and from previous work it is probable that the axons of at least some of these cells form flattened vesicle symmetrical synapses upon the granule cells. ![]() Several types of short axon cells have been found in the granule cell layer in Golgi-impregnated material. Synaptic-type vesicles are found in all parts of the mitral cells, including the axon initial segments they appear to be especially concentrated in the distal portions of the dendrites. Within the glomeruli the mitral cell dendrites are in synaptic contact with the olfactory nerves and also with the periglomeiular cells, but elsewhere the only synapses on the mitral cells are the ‘reciprocal synapses’ with the granule cells. No predominant antero-posterior orientation of the secondary dendrites has been found. The mitral cells are large neurons with primary and secondary dendrites which both extend into the overlying external plexiform layer, although only the primary dendrite enters the glomerular formations. A description is given of the mitral and short axon cells of the olfactory bulb of the rat from Golgi material examined with the light microscope and from material examined with the electron microscope.
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