Answer :
Final answer:
The spinal arteries divide the medulla into specific regions, known as vascular zones, hence the correct answer is 4) Vascular zones.
Explanation:
The spinal arteries supply blood to the medulla and create distinct vascular zones that are associated with specific potential functional losses when they experience reduced blood flow.
These regions are typically referred to as vascular territories or vascular zones within the medulla, rather than ischemic, hypoxic, or infarcted zones, although these latter terms describe the condition of the tissue when blood supply is insufficient. If a spinal artery is compromised, the corresponding vascular zone will suffer, potentially leading to a cerebrovascular accident (CVA), also known as a stroke.
