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相关概念视频

Gustation01:43

Gustation

51.8K
Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
51.8K
The Physiology of Taste01:24

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
7.0K
Taste Buds and Receptors01:20

Taste Buds and Receptors

4.5K
Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
4.5K
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

12.1K
Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Olfaction01:25

Olfaction

48.0K
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
48.0K
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

11.1K
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
11.1K

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相关实验视频

Updated: Jan 8, 2026

New Methods to Study Gustatory Coding
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New Methods to Study Gustatory Coding

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一个横向的途径,用于将营养与味道关联在一起.

James C R Grove1,2,3,4, Anna M Hakimi1,2,3, Queenie Li4

  • 1Department of Physiology, University of California, San Francisco.

bioRxiv : the preprint server for biology
|December 15, 2025
PubMed
概括

动物通过专门的多巴胺通路学会将食物的味道与营养含量联系起来. 这条路径显示出对左脑半球的偏好,将肠道信号与味道集成为有效的味道营养学习.

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Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
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Appetitive Associative Olfactory Learning in Drosophila Larvae
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相关实验视频

Last Updated: Jan 8, 2026

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科学领域:

  • 神经科学是一个神经科学.
  • 行为生物学 行为生物学
  • 生理学 生理学 生理学

背景情况:

  • 动物利用口腔和肠道的感知信号来了解食物.
  • 对于学习的口腔和肠道营养信号的整合机制仍然不清楚.
  • 多巴胺通路与学习有关,但它们在特定营养素学习中的作用尚不清楚.

研究的目的:

  • 为了确定神经通路参与学习食物的营养含量.
  • 为了研究口腔和肠道的信号是如何整合的,以获得风味和营养的关联.
  • 在与营养相关的学习中探索多巴胺信号传递的横向化.

主要方法:

  • 研究了在腹部体区域 (VTA) 和底侧杏仁体 (BLA) 的多巴胺神经元活动.
  • 在小鼠中利用双光子成像来观察在食期间的神经元活动.
  • 检查了表达胆囊托基宁 (CCK) 神经元及其投影的作用.
  • 沉默特定的神经元以评估它们对味道营养学习的必要性.

主要成果:

  • 从VTA到前部BLA的横向多巴胺通路对于味道营养学习至关重要.
  • 摄入后的营养物质会在小鼠和人类的左前侧BLA中选择性地触发多巴胺释放.
  • 肠道传感器激活CCK表达的VTA多巴胺神经元,这些神经元投射到前额.
  • 刺激这些多巴胺终端增强了味道营养学习,而沉默它们会损害它.

结论:

  • 通过横向的多巴胺通路为动物学习食物的营养含量建立了神经基础.
  • 在多巴胺信号传递中表现出功能横向化,偏好左半球对摄入后营养素的表现.
  • 突出了前面的BLA作为一个关键的整合网站的味觉和消化后的线索在味道营养学习.