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Motor neurons of the anterior horn of the spinal cord (200X)

Microimage
Motor neurons of the anterior horn of the medulla oblongata. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

Ventral nerve roots consist of efferent fibers that arise from motor neurons whose cell bodies are found in the ventral (or anterior) gray horns of the spinal cord as seen here.