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Related Concept Videos

Hormones of the Pituitary Gland01:27

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The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
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The pituitary is a small endocrine organ in the sphenoid bone under the hypothalamus. Primarily, the pituitary in adults has two distinct anatomical and functional regions— the anterior and posterior lobes. During human fetal development, a third pituitary gland region called the pars intermedia atrophies and disappears. However, some of its cells migrate and exist adjacent to the anterior pituitary in adults.
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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Adrenergic Neurons: Neurotransmission01:27

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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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Magnocellular Neurons and Posterior Pituitary Function.

Colin H Brown1

  • 1Brain Health Research Centre, Centre for Neuroendocrinology and Department of Physiology, University of Otago, Dunedin, New Zealand.

Comprehensive Physiology
|October 27, 2016
PubMed
Summary
This summary is machine-generated.

The posterior pituitary releases oxytocin and vasopressin, crucial hormones for childbirth, lactation, and maintaining fluid balance and blood pressure. Their secretion from magnocellular neurons is regulated by reproductive, osmotic, and cardiovascular signals.

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Area of Science:

  • Neuroendocrinology
  • Physiology

Background:

  • The posterior pituitary gland secretes oxytocin and vasopressin (antidiuretic hormone).
  • Oxytocin is vital for parturition and lactation.
  • Vasopressin regulates water reabsorption and blood pressure.

Purpose of the Study:

  • To review the control mechanisms of magnocellular neuron activity.
  • Emphasis on regulation by reproductive, osmotic, and cardiovascular status.

Main Methods:

  • Review of existing literature on magnocellular neuron function.
  • Analysis of afferent information integration.

Main Results:

  • Magnocellular neuron activity, primarily action potentials, dictates hormone secretion.
  • Secretion is modulated by reproductive, osmotic, and cardiovascular states.
  • Local glial and intrinsic neuronal regulation also play roles.

Conclusions:

  • Magnocellular neuron activity is precisely controlled to ensure appropriate oxytocin and vasopressin release.
  • This regulation is essential for adapting to changing physiological conditions.