Definition: the larger Burdach nucleus; one of the three nuclei of the posterior column of the spinal cord; located near the posterior surface of the medulla oblongata at and below the level of the obex, the nucleus receives posterior root fibers corresponding to the sensory innervation of the arm and hand of the same side; it consists of a pars centralis [TA] (central part [TA], cell nest region [TAalt]) and a pars rostralis [TA] (rostral part [TA], shell region [TAalt]); together with its medial companion, the gracile nucleus, it is the major source of origin of the medial lemniscus.
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