Role in the functional nutrition system
The ventromedial hypothalamus (VMH) is a central structure of the functional nutrition system. It interacts with the lateral hypothalamus (LH), which acts as the "hunger center". The interaction of these two centers shapes food-seeking behavior.
The process of satiety is divided into two types:
- Sensory satiety — develops during the passage of food through the oral cavity, esophagus, and stomach; it is associated with signals from receptors prior to absorption.
- Metabolic satiety — occurs after the absorption of nutrients into the bloodstream and represents true satiety.
Mechanisms of regulation of the satiety center
In the functional nutrition system, the main regulated parameter is blood nutrients.
- Vascular chemoreceptors: detect the concentration of nutrients in the blood and transmit a signal to the CNS — to the LH and VMH.
- Hormonal regulation and leptin: leptin is produced in fat cells (adipocytes). The level of circulating leptin is directly proportional to the amount of fat mass. Leptin receptors are present on many cells, with the key target being the neurons of the ventromedial hypothalamic nucleus. Leptin reduces appetite and increases the body's energy expenditure. Its secretion is pulsatile in nature, peaking at night (24:00–04:00) and reaching a minimum in the morning and at noon.
What happens upon stimulation and damage?
The functional role of the ventromedial hypothalamus is demonstrated in experiments:
- Electrical stimulation: leads to the cessation of eating even in hungry animals.
- Bilateral destruction: animals have difficulty finishing meals due to the absence of the feeling of satiety. Hyperphagia and bulimia ("wolfish hunger") develop, resulting in obesity. For comparison: destruction of the lateral regions, responsible for hunger, leads to refusal of food — aphagia.
- Pharmacological intervention: sibutramine is indicated for weight reduction, as it blocks the satiety center.
Do not confuse: VMH in neurology
In medical texts, the abbreviation VMH also stands for intracerebral hematoma. Intracerebral hemorrhage belongs to the classification of nontraumatic intracranial hemorrhages in hemorrhagic stroke.
To assess severity and prognosis in intracerebral hematoma, the ICH Score is used. It takes into account: the level of consciousness on the Glasgow Coma Scale, VMH volume, presence of intraventricular hemorrhage, subtentorial location of the VMH, and patient age.
Class and exam questions
What happens if the ventromedial hypothalamus is destroyed?
Bilateral destruction of this area leads to the absence of the feeling of satiety: animals have difficulty finishing meals. Hyperphagia, bulimia ("wolfish hunger"), and obesity develop.
Which hormone is associated with the satiety center?
Leptin. It is produced in fat cells (adipocytes), reduces appetite, and increases energy expenditure. The key target of leptin is the neurons of the ventromedial hypothalamic nucleus.
How are vascular chemoreceptors connected to the hypothalamus?
Vascular chemoreceptors perceive the concentration of nutrients in the blood and transmit a signal to the CNS — to the lateral and ventromedial hypothalamus.
What else to study on this topic
- Lateral hypothalamus (hunger center)
- Leptin and lipid metabolism disorders
- Functional system of nutrition
- Metabolic and sensory satiety
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