What is role of primary capillary in infundibulum and secondary capillary in anterior pituitary
The primary capillary plexus in the infundibulum is responsible for carrying hormones synthesized in the hypothalamus to the anterior pituitary gland. Its role is to transport releasing and inhibiting hormones from the hypothalamus to the secondary capillary plexus in the anterior pituitary.
The secondary capillary plexus in the anterior pituitary is where the releasing and inhibiting hormones released by the hypothalamus act on the cells of the anterior pituitary gland. This interaction stimulates or inhibits the release of various hormones from the anterior pituitary gland into the bloodstream. In other words, the secondary capillary plexus serves as a site of interaction between the releasing and inhibiting hormones from the hypothalamus and the cells of the anterior pituitary gland, which subsequently control the secretion of pituitary hormones into the bloodstream.
In the infundibulum, the primary capillary network plays a crucial role in transporting releasing hormones from the hypothalamus to the anterior pituitary gland. These releasing hormones are produced by specialized neurosecretory cells in the hypothalamus and are responsible for regulating the release of hormones from the anterior pituitary.
The releasing hormones are released into the primary capillary network, which then transports them to the secondary capillary network in the anterior pituitary. The secondary capillary network is located in close proximity to the endocrine cells in the anterior pituitary and allows for efficient exchange of hormones between the capillaries and the endocrine cells.
The releasing hormones released into the secondary capillary network stimulate or inhibit the release of specific hormones from the endocrine cells in the anterior pituitary. These hormones then enter the systemic circulation and travel to their target organs or tissues, where they exert their physiological effects.
Overall, the primary and secondary capillary networks in the infundibulum and anterior pituitary play a vital role in the regulation and control of hormone release, ensuring proper communication between the hypothalamus and the anterior pituitary gland.
The primary capillary plexus in the infundibulum and the secondary capillary plexus in the anterior pituitary play important roles in the regulation and release of hormones.
To understand their roles, let's break it down step by step:
1. Hypothalamus regulation: The hypothalamus, a region of the brain, produces and releases specific hormones called releasing hormones (RH) or inhibiting hormones (IH). These hormones travel through a network of blood vessels called the hypophyseal portal system.
2. Primary capillary plexus in the infundibulum: The hypophyseal portal system connects the hypothalamus to the anterior pituitary gland. In the infundibulum, which is the stalk connecting the hypothalamus to the pituitary gland, you'll find the primary capillary plexus. Here, the releasing or inhibiting hormones from the hypothalamus are released into the blood vessels.
3. Blood flow to the anterior pituitary: The blood carrying the releasing or inhibiting hormones from the primary capillary plexus in the infundibulum then flows into the secondary capillary plexus in the anterior pituitary gland.
4. Secondary capillary plexus in the anterior pituitary: This network of capillaries in the anterior pituitary is where the hypothalamic hormones exert their effects. The releasing hormones stimulate or inhibit the release of specific hormones from the anterior pituitary gland into the bloodstream. These hormones, known as tropic hormones or adenohypophyseal hormones, then target various endocrine glands or tissues throughout the body, regulating their activities.
In summary, the primary capillary plexus in the infundibulum carries the releasing or inhibiting hormones from the hypothalamus, while the secondary capillary plexus in the anterior pituitary gland allows these hormones to act on the pituitary gland, ultimately influencing the release of other hormones that regulate various body functions.