A set of findings that may be produced by incomplete or complete hemisection (damage to one side) of the spinal cord: 1) Ipsilateral upper motor neuron paralysis involving muscles innervated by segments below the lesion. 2) Ipsilateral lower motor neuron paralysis involving muscles innervated by the damaged segments. 3) Contralateral loss of pain and temperature sensation beginning several dermatomes below the level of lesion. 4) Ipsilateral loss of two-point discrimination and joint position sense below the level of lesion. 5) Anesthesia to all sensations in dermatomes supplied by the damaged segments.