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Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

1.3K
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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Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

3.1K
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.
Humoral...
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Diencephalon: Anatomical Regions01:30

Diencephalon: Anatomical Regions

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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...
1.5K
Target Cell Response to Hormones01:22

Target Cell Response to Hormones

2.8K
Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
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Regulation of Food Intake01:30

Regulation of Food Intake

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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
174
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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Updated: May 24, 2025

Author Spotlight: Hypothalamic Neural Mechanism Insights
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Author Spotlight: Hypothalamic Neural Mechanism Insights

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感覚入力,性別,機能形状 ヒポタラム細胞のタイプ開発

Harris S Kaplan1, Brandon L Logeman1, Kai Zhang2,3

  • 1Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, Center for Brain Science, Harvard University, Cambridge, MA, USA.

Nature
|March 5, 2025
PubMed
まとめ
この要約は機械生成です。

哺乳類の生命の初期には 重要な行動や生理学的変化が伴います 脳内のニューロン集団が

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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
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Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition
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Last Updated: May 24, 2025

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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
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Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition
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科学分野:

  • 神経科学
  • 発達生物学
  • ゲノミクス

背景:

  • 哺乳類の初期には 行動や生理学における 重要な発達変化が特徴です
  • 視床下部のニューロンの集団は,重要なホメオスタティックと社会的機能を調節する.
  • これらの重要なニューロン集団の 発達経路は 生命の初期に 十分に理解されていません

研究 の 目的:

  • 視床下部におけるニューロン集団の発達軌道を調査する.
  • 性別,位置,細胞の種類によってどのように影響されているかを理解する.
  • 前視の発達における重要な発達段階と感覚インプットの役割を特定する.

主な方法:

  • 下垂体前視領域の神経のペア化トランスクリプトミクスとクロマチンのアクセシビリティプロファイリング.
  • 人生の様々な段階における 発達経路の分析
  • 感覚変異体の前視の発達を評価し,特に口鼻の感覚に重点を置く.

主要な成果:

  • 性別や細胞型によって影響される ニューロンの発達経路の有意な多様性
  • 重要な発達段階の特定: 早期の多様化, 生後性差異, 産後成熟, 離乳と思春期の加速変化
  • 前視細胞型成熟のタイミングにおける 吐口鼻センサーの重要な役割の実証

結論:

  • 下垂体前視領域のニューロン発達は非常にダイナミックで 性別に依存している.
  • 感覚システム,特に口鼻感覚は,前視神経の成熟を指揮する上で重要な役割を果たします.
  • これらの発見は 生命の初期における ホメオスタシスと社会的行動の 発達的基盤について 新たな洞察を 提供しています