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Spinal Cord. Transverse section. Low power. White matter, i.e., nerve fibers in tracts, (red arrows) lies peripherally. Central gray matter (that is, where nerve cells are located) stains lighter (yellow and orange arrows) and is in the form of an 'H.' The spinal cord is divided into right and left halves by the anterior median fissure (blue arrow) and the posterior median septum (black arrow). The gray matter is divided into ventral (yellow arrow) and posterior horns (orange arrow). Large motor neurons lie in the ventral horns.