The Anterior spinal artery supplies the ventral 2/3 of the spinal cord whereas the posterior spinal artery supplies the dorsal 1/3 of the spinal cord.

• Therefore in an anterior cord syndrome, there is motor involvement (both the anterior horn cells (which are the cell bodies of the lower motor neuron) and corticospinal tract (which are the axons of the upper motor neuron) and pain and temperature loss
• In a posterior cord syndrome, only position sense and vibration are affected