Which brain structure regulates the pituitary gland by releasing hormones into the portal blood vessels?

Which brain structure regulates the pituitary gland by releasing hormones into the portal blood vessels?

• A. Cerebral cortex
• B. Basal ganglia
• C. Hippocampus
• D. Hypothalamus

Answer: (D)

Hypothalamus controls the pituitary via the hypophyseal portal system. It releases releasing and inhibiting hormones straight into a special network of blood vessels that connect to the anterior pituitary (the adenohypophysis). These hormones travel through the portal vessels to regulate the secretion of pituitary hormones like ACTH, TSH, LH/FSH, growth hormone, and prolactin. This setup provides precise, local control over pituitary function. The other regions listed are involved in different functions—cerebral cortex in thinking, basal ganglia in movement, and hippocampus in memory—and they don’t regulate the pituitary through portal blood vessels.

Hypothalamus controls the pituitary via the hypophyseal portal system. It releases releasing and inhibiting hormones straight into a special network of blood vessels that connect to the anterior pituitary (the adenohypophysis). These hormones travel through the portal vessels to regulate the secretion of pituitary hormones like ACTH, TSH, LH/FSH, growth hormone, and prolactin. This setup provides precise, local control over pituitary function. The other regions listed are involved in different functions—cerebral cortex in thinking, basal ganglia in movement, and hippocampus in memory—and they don’t regulate the pituitary through portal blood vessels.