What are the features of lesions in the dorsal columns?
The dorsal columns relay fibers that are involved in proprioception and vibration.
These fibers are also arranged somatotopically. However, within the dorsal columns the sacral fibers are medial and the cervical fibers are lateral.
Thus, lateral lesions within the dorsal column will damage fibers from the cervical region.
And conversely, medially located lesions in the dorsal column will damage sacral fibers.
Lesions in the dorsal columns may result in deficits in vibration, proprioception, and two-point discrimination.
Lhermittes sign may also be present.