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Related Concept Videos

Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

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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.
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Body Temperature01:25

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The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Related Experiment Video

Updated: Jul 10, 2025

Author Spotlight: Hypothalamic Neural Mechanism Insights
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Dorsomedial and preoptic hypothalamic circuits control torpor.

Hiroshi Yamaguchi1, Keith R Murphy2, Noriaki Fukatsu3

  • 1Department of Neural Regulation, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Aichi 464-8601, Japan; PRESTO, Japan Science and Technology Agency (JST), Tokyo, Japan.

Current Biology : CB
|November 22, 2023
PubMed
Summary

Researchers identified key brain circuits regulating torpor, a hypometabolic state enabling endotherms to survive cold and starvation. Specific neurons in the hypothalamus are crucial for controlling body temperature and metabolic rate during torpor.

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Area of Science:

  • Neuroscience
  • Physiology
  • Animal Behavior

Background:

  • Endotherms utilize torpor, a hypometabolic state, to endure environmental challenges like low temperatures and food scarcity.
  • While the brain regulates torpor, the precise neural circuits involved remain incompletely understood.

Purpose of the Study:

  • To elucidate the neural circuits governing torpor regulation in endotherms.
  • To identify specific neuronal populations and their connections essential for entering and maintaining torpor.

Main Methods:

  • Whole-brain mapping of torpor-activated neurons.
  • Cell-type-specific manipulation of neural activity.
  • Viral tracing for circuit mapping.

Main Results:

  • Trpm2-positive neurons (preoptic area) and Vgat-positive neurons (dorsal medial hypothalamus) are activated during torpor.
  • Silencing either Trpm2 or Vgat neurons prevents entry into torpor, highlighting their necessity.
  • Identified projections from arcuate and suprachiasmatic nuclei to these key hypothalamic neurons, and their projections to thermoregulatory centers.

Conclusions:

  • Hypothalamic neurons play a critical role in regulating body temperature and metabolic rate during torpor.
  • Identified specific neuronal populations and their connectivity as crucial nodes within the torpor regulatory network.