Lesion on the patient's right The hemisection of the cord results in a lesion of each of the three main neural systems: * the principal upper motor neuron pathway of the corticospinal tract * one or both dorsal columns * the spinothalamic tract As a result of the injury to these three main brain pathways the patient will present with three lesions: * The corticospinal lesion produces spastic paralysis on the same side of the body below the level of the lesion (due to loss of moderation by the UMN). At the level of the lesion, there will be flaccid paralysis of the muscles supplied by the nerve of that level (since lower motor neurons are affected at the level of the lesion). * The lesion to fasciculus gracilis or fasciculus cuneatus (dorsal column) results in ipsilateral loss of vibration and proprioception (position sense) as well as loss of all sensation of fine touch. * The loss of the spinothalamic tract leads to pain and temperature sensation being lost from the contralateral side beginning one or two segments below the lesion. In addition, if the lesion occurs above T1 of the spinal cord it will produce ipsilateral Horner's<unk>  with involvement of the oculosympathetic pathway.
Brown-Séquard syndrome
Occipital horn syndrome
Brown's syndrome
Posterior cord syndrome
Lateral medullary syndrome
Terson syndrome
Central cord syndrome
Medial medullary syndrome