Abstract

Using the Golgi silver impregnation technique the present study examines the morphology and development of presumptive local circuit neurons in lamina III of the rat lumbar spinal cord. These neurons generate local axonal plexuses which remain within the gray matter and dendritic trees which arborize in lamina III and the inner zone of lamina II. Analysis of developmental stages supports the contention that these neurons have local axons which do not enter the white matter. These cells undergo axonal and dendritic maturation during the postnatal period, well after the maturation of long axon neurons. This pattern parallels the development of local circuit neurons in lamina II.

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