Q. Assertion : Pituitary is attached to hypothalamus by a vein.
Reason : This attachment is done through a hypophysial portal vein.

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Solution:

Pituitary gland or hypophysis is situated in a depression, the sella turcica of sphenoid bone of the skull. It is directly attached to the hypothalamus by a stalk, the infundibulum. Hypophysial portal veins carry blood containing neurohormones (releasing factors) from the hypothalamus to the anterior pituitary.