The condition usually consists of: Description Source of damage Number on diagram a deviation of the tongue to the side of the infarct on attempted protrusion, caused by ipsilateral muscle weakness. hypoglossal nerve fibers #8 limb weakness (or hemiplegia, depending on severity), on the contralateral side of the infarct medullary pyramid and hence to the corticospinal fibers of the pyramidal tract #5 a loss of discriminative touch, conscious proprioception, and vibration sense on the contralateral side of the infarct (body below head)<unk>  leminiscus #6 Human brainstem blood supply description. ASA is#13. Sensation to the face is preserved, due to the sparing of the trigeminal nucleus. The syndrome is said to be "alternating" because the lesion causes symptoms both contralaterally and ipsilaterally. Sensation of pain and temperature is preserved, because the spinothalamic tract is located more laterally in the brainstem and is also not supplied by the anterior spinal artery (instead supplied by the posterior inferior cerebellar arteries and the vertebral arteries).
Medial medullary syndrome
Lateral medullary syndrome
Central cord syndrome
Occipital horn syndrome
Anterior spinal artery syndrome
Vascular myelopathy
Posterior cord syndrome
Acute flaccid myelitis