What is posterior lobe of the pituitary gland?
The posterior lobe of the pituitary gland develops as an extension of the hypothalamus. As such, it is not capable of producing its own hormones; instead, it stores hypothalamic hormones for later release into the systemic circulation.
What is pituitary gland slide share?
Pituitary Gland (Anatomy) Also called the hypophesis Measures about 1 centimeter in diameter and 0.5 to 1 gram in weight Lies in the sella turcica, connected to the hypothalamus by the pituitary/hypophysial stalk. Physiologically, divided into two distinct portions: 1. Anterior pituitary (Adenohypophysis) 2.
What is the main function of the posterior pituitary gland?
The primary function of the posterior pituitary is the transmission of hormones originating from neurons located in hypothalamic brain regions such as the supraoptic nucleus (SON) and paraventricular nucleus (PVN) for secretion directly into peripheral circulation.
How is the posterior lobe of the pituitary gland controlled?
The posterior lobe contains the ends of nerve cells coming from the hypothalamus. The hypothalamus sends hormones directly to the posterior lobe via these nerves, and then the pituitary gland releases them.
What does the posterior lobe consist of?
The posterior lobe of the pituitary gland consists largely of extensions of processes (axons) from two pairs of large clusters of nerve cell bodies (nuclei) in the hypothalamus.
What is the anatomy of the pituitary gland?
The pituitary gland is entirely ectodermal in origin but is composed of 2 functionally distinct structures that differ in embryologic development and anatomy: the adenohypophysis (anterior pituitary) and the neurohypophysis (posterior pituitary).
What is hormone Slideshare?
A hormone is a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behavior. or Or Hormones are substances produced by highly specialized tissues called the “Endocrine” or “ductless glands”, carried …
What is the difference between anterior and posterior pituitary gland?
The main difference between anterior and posterior pituitary gland is that the action of the anterior pituitary gland is regulated through vessels connected to the hypothalamus whereas the action of the posterior pituitary gland is regulated through nerves connected to the hypothalamus.
What is the role of the posterior pituitary and what is its histology?
Posterior Pituitary. It contains non-myelinated axons which are the neurosecretory cells. The cell bodies of these cells are located in the hypothalamus. It only secretes two hormones: Antidiuretic hormone (ADH) which acts on the kidney, and oxytocin, which acts on the uterus.
What does the posterior portion of pituitary gland release?
The posterior lobe produces two hormones, vasopressin and oxytocin. These hormones are released when the hypothalamus sends messages to the pituitary gland through nerve cells. Vasopressin is also known as antidiuretic hormone (ADH).
What is the posterior pituitary histology?
The posterior pituitary resembles unmyelinated nervous tissue and is composed of the nerve cell terminals that run down from neurons whose cell bodies are located in the hypothalamus. Herring bodies are distensions of the axon terminal fibers where neurosecretory granules have accumulated.