from where does it get its blood supply?
It is supplied with blood by three arteries.
Spinal cord
The spinal cord is supplied with blood by three arteries that run along its length starting in the brain, and many arteries that approach it through the sides of the spinal column. 
where does loss of function occur in a spinal cord injury Spinal cord how is this injury classified as? Classified into three types based on cause: mechanical forces, toxic, and ischemic (from lack of blood flow). what are the causes for this injury? Physical trauma what are the symptoms a person experiences with this injury? Pain, numbness, or a loss of sensation in the related areas. what are the complications associated with it? Pulmonary edema, respiratory failure, neurogenic shock, and paralysis below the injury site. mention some treatments provided for the betterment of the injured patients. Prehospital treatment and Early hospital treatment where does that spinal column connect between? From the medulla oblongata in the brainstem to the lumbar region of the vertebral column.
wiki:20510889
Spinal cord [SEP] Blood supply
The spinal cord is supplied with blood by three arteries that run along its length starting in the brain, and many arteries that approach it through the sides of the spinal column. The three longitudinal arteries are the anterior spinal artery, and the right and left posterior spinal arteries. These travel in the subarachnoid space and send branches into the spinal cord. They form anastamoses (connections) via the anterior and posterior segmental medullary arteries, which enter the spinal cord at various points along its length. The actual blood flow caudally through these arteries, derived from the posterior cerebral circulation, is inadequate to maintain the spinal cord beyond the cervical segments.