Definition: a slight protrusion of the gray matter of the spinal cord into the lateral funiculus of either side, especially marked in the thoracic region where it encloses preganglionic motor neurons of the sympathetic division of the autonomic nervous system; it corresponds to the lateral horn appearing in transverse sections of the spinal cord.
See Also: gray columns
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.