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refers to a group of cells oriented longitudinally and embedded in the lateral white column close to the posterior gray column in upper cervical segments of the spinal cord ( Carpenter-1983 ). Identified by Nissl stain the cell group extends into the lower third of the medulla where it may constitute the paratrigeminal nucleus ( Swanson-2004 ). The nucleus is found in the rat, cat and dog; it appears in only 50% of humans and is well developed in only 10% ( Truex-1970 ).
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