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The following 2 entries include the term posterior median.
posterior median septum
noun: a sheet of glial tissue in the midsagittal plane of the spinal cord that extends from the posterior median sulcus toward the gray commissure and that partitions the posterior part of the spinal cord into right and left halves
posterior median sulcus
noun: a shallow groove along the midline of the posterior part of the spinal cord that separates the two posterior funiculi and is the external boundary of the posterior median septum
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Merriam-Webster unabridged
