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Related Concept Videos

Introduction to Special Senses01:26

Introduction to Special Senses

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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...
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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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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...
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Sensory Modalities01:15

Sensory Modalities

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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...
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Somatosensation01:33

Somatosensation

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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.
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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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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.
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Introduction to Sensory Receptors01:31

Introduction to Sensory Receptors

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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...
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Updated: Aug 3, 2025

Establishing an Octopus Ecosystem for Biomedical and Bioengineering Research
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Sensory specializations drive octopus and squid behaviour.

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
Summary
This summary is machine-generated.

Cephalopod evolution is linked to changes in chemotactile receptors (CRs). Structural adaptations in octopus and squid CRs enable distinct environmental sensing and behaviors, revealing evolutionary pathways for sensory systems.

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Area of Science:

  • * Evolutionary biology
  • * Molecular biology
  • * Neuroscience

Background:

  • * New traits facilitate adaptation to novel ecological and behavioral niches.
  • * Links between protein structure divergence and lineage-specific behaviors are scarce.
  • * Cephalopods possess unique sensory systems for marine environment interaction.

Purpose of the Study:

  • * To investigate the structural and functional divergence of cephalopod-specific chemotactile receptors (CRs).
  • * To understand how CR adaptations support distinct physiological roles and behaviors in octopuses and squid.
  • * To elucidate the evolutionary transition of CRs from soluble molecule detection to contact-dependent chemosensation.

Main Methods:

  • * Genetic profiling and phylogenetic analysis of CRs.
  • * Physiological and behavioral assays.
  • * Cryo-electron microscopy for structural determination of squid CRs.

Main Results:

  • * Squid express ancient CRs similar to nicotinic acetylcholine receptors, detecting soluble bitter molecules for predation.
  • * Octopuses show a recent expansion of CRs, supporting an advanced 'taste by touch' system.
  • * Structural analysis reveals an evolutionary shift from an ancestral 'cage' to an octopus CR hydrophobic pocket for insoluble molecule binding.

Conclusions:

  • * Structural adaptations in cephalopod CRs drive the evolution of distinct sensory capabilities and behaviors.
  • * The study provides a framework for understanding protein structure's role in organismal trait diversification.
  • * Evolutionary changes in CRs underpin the diverse ecological strategies of octopuses and squid.