lamina I
Acronym: I
The term lamina I refers to the thin layer of gray substance that caps the horn of the posterior gray column of the spinal central gray and wraps around its margins. Defined by cytoarchitecture it is most prominent in the lumbar enlargement. It is bounded externally by the dorsolateral fasciculus of the spinal cord and internally by lamina II of the posterior gray column ( Carpenter-1983 ). In the functional model of central nervous system organization it is classified as part of the subcortical somatosensory system ( Swanson-2004 ) (see Models Where It Appears below).

Also known as: marginal nucleus, Rexed's lamina I, Lamina 1, Zona spongiosa


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