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関連する概念動画

Introduction to Special Senses01:26

Introduction to Special Senses

5.9K
Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
5.9K
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

3.2K
The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
3.2K
Sensory Modalities01:15

Sensory Modalities

1.4K
Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
1.4K
Somatosensation01:33

Somatosensation

36.9K
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
36.9K
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

332
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
332
Introduction to Sensory Receptors01:31

Introduction to Sensory Receptors

3.6K
Sensory receptors are vital in our ability to perceive and interpret the world. Sensory receptors are specialized cells in the peripheral nervous system that respond to various stimuli and enable one to experience different sensations. Based on specific criteria, sensory receptors are classified into distinct types.
The first classification criterion is based on cell type, position, and function. Some receptor cells are neurons with free nerve endings, where their dendrites are embedded in the...
3.6K

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感覚の特化がタコやイカの行動に 影響を及ぼします

Guipeun Kang1,2, Corey A H Allard3, Wendy A Valencia-Montoya3,4,5

  • 1Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX, USA.

Nature
|April 12, 2023
PubMed
まとめ

頭足類の進化は,化学触覚受容体 (CRs) の変化と関連している. 章魚とイカのCRの構造的適応は 独特の環境感知と行動を可能にし 感覚システムの進化の経路を明らかにします

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科学分野:

  • * 進化生物学
  • * 分子生物学
  • * 神経科学

背景:

  • * 新しい特徴は,新しい生態学的および行動的ニッチへの適応を容易にする.
  • * タンパク質構造の分岐と系統特有の行動の間のリンクは稀です.
  • * 頭足類は海洋環境との相互作用に 独特な感覚システムを備えています

研究 の 目的:

  • * 頭足類特異的な化学触覚受容体 (CRs) の構造的および機能的差異を調査する.
  • * CRの適応が,タコとイカの異なる生理学的役割と行動をどのようにサポートするかを理解する.
  • * 溶性分子の検出から接触依存の化学感知へのCRの進化的移行を明らかにする.

主な方法:

  • * 遺伝子プロファイリングとCRの遺伝子解析
  • * 生理学的および行動的検査
  • クラミーのCRの構造的決定のための冷凍電子顕微鏡.

主要な成果:

  • * ニコチンアセチルコリン受容体と似た古代CRを発現し,捕食のために溶解性の苦い分子を検出する.
  • "タッチによる味覚"システムをサポートする CR の最近の拡張を示しています.
  • * 構造分析により,祖先の"ケージ"から,不溶性分子結合のためのオクトープスCR水性ポケットへの進化的シフトが明らかになった.

結論:

  • * 頭足類CRの構造的適応は 異なる感覚能力と行動の進化を促します
  • * この研究は,生物の特徴の多様化におけるタンパク質構造の役割を理解するための枠組みを提供する.
  • * CRの進化的変化は,タコとイカの多様な生態学的戦略を支えている.