Final answer:
The releasing and inhibiting hormones from the hypothalamus directly regulate the secretions of the anterior pituitary gland.
Step-by-step explanation:
The releasing and inhibiting hormones of the hypothalamus directly regulate the secretions of the anterior pituitary gland. The hypothalamus secretes hormones that control the release of several hormones from the anterior pituitary, including growth hormone (GH), prolactin (PRL), thyroid-stimulating hormone (TSH), melanin-stimulating hormone (MSH), adrenocorticotropic hormone (ACTH), follicle-stimulating hormone (FSH), and luteinizing hormone (LH). These regulatory hormones include both releasing hormones, which stimulate hormone secretion, and inhibiting hormones, which suppress it. They travel from the hypothalamus through the hypophyseal portal system to the anterior pituitary, where they have their effect.