Final answer:
The median eminence is a bulge at the base of the brain, and it is supplied by the hypothalamic portal vein, which is a vessel that connects the hypothalamus and the anterior pituitary.
Step-by-step explanation:
The median eminence is a structure located at the base of the brain, which acts as a site for the secretion of regulatory hormones. These hormones then enter the blood vessels and control the pituitary gland. The correct answer to which blood vessel supplies the median eminence is d) Bulge at the base of the brain; hypothalamic portal vein. The hypothalamic portal vein is a vessel system that provides a direct connection between the hypothalamus and the anterior pituitary, allowing neurohormones from the hypothalamus to be transported directly to the pituitary.