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相关概念视频

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

7.9K
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

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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...
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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...
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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在幼儿中描述嗅觉大脑反应的特征

Laura K Shanahan1,2, Leena B Mithal3,4, Marci Messina5

  • 1Department of Psychology, Rhodes College, Memphis, Tennessee 38112 shanahanl@rhodes.edu thorsten.kahnt@nih.gov.

The Journal of neuroscience : the official journal of the Society for Neuroscience
|January 27, 2025
PubMed
概括

婴儿的气味感知在嗅觉皮质和乳头中显示出强烈的大脑反应. 鼻气流可能表明气味偏好,但在1个月大的婴儿中没有发现特定气味的独特神经模式.

关键词:
解码的解码方法是功能磁力共振成像 (fMRI) 是一种婴儿 婴儿 婴儿 婴儿 婴儿嗅觉 嗅觉是一种嗅觉.呼吸系统 呼吸系统 呼吸系统瓦伦西亚的价值观

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科学领域:

  • 神经科学是一个神经科学.
  • 发展生物学 发展生物学
  • 感官感知是一种感官感知.

背景情况:

  • 嗅觉对人类早期发育至关重要.
  • 婴儿嗅觉的神经机制在很大程度上仍然没有被描述.
  • 了解婴儿的感官处理对于发育洞察至关重要.

研究的目的:

  • 为了研究1个月大的婴儿对气味的神经反应.
  • 探索由食欲与厌恶气味引起的大脑活动的差异.
  • 评估婴儿鼻气流和气味价值之间的关系.

主要方法:

  • 功能磁共振成像 (fMRI) 用于记录睡眠婴儿的大脑活动.
  • 在气味呈现过程中同时收集鼻腔气流数据.
  • 多变量模式分析技术应用于fMRI数据.

主要成果:

  • 气味引起了婴儿嗅觉皮质和乳头体内的显著fMRI活动.
  • 在不同的气味刺激中,fMRI响应的大小有所不同.
  • 没有在嗅觉皮层或丘脑中检测到明确的fMRI活动模式来区分气味类型.
  • 与厌恶气味相比,婴儿对食欲愉快的气味的吸入空气流率较高.

结论:

  • 婴儿在一个月大时对气味表现出强大的神经反应.
  • 虽然整体大脑活动是显而易见的,但在这个早期阶段,通过fMRI模式的特定气味歧视没有得到证实.
  • 鼻腔气流调节表明婴儿气味偏好的潜在行为指标.
  • 需要进一步的研究才能充分阐明婴儿嗅觉感知的神经基础.