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Related Concept Videos

Introduction to Sensory Receptors01:31

Introduction to Sensory Receptors

3.2K
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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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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Unrenewable Cells00:50

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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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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What is a Sensory System?01:31

What is a Sensory System?

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Related Experiment Video

Updated: Jun 21, 2025

A Bioinformatics Pipeline for Investigating Molecular Evolution and Gene Expression using RNA-seq
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Evolution of Sensory Receptors.

Wendy A Valencia-Montoya1,2, Naomi E Pierce2, Nicholas W Bellono1

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA; email: wvalenciamontoya@g.harvard.edu, nbellono@harvard.edu.

Annual Review of Cell and Developmental Biology
|July 10, 2024
PubMed
Summary

Sensory receptors evolved early in animal history, with some predating multicellularity. Their diversification, driven by environmental pressures and natural selection, fuels speciation and animal diversity.

Keywords:
chemoreceptorsion channelslight receptorsmechanoreceptorssensory drivethermoreceptors

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Area of Science:

  • Evolutionary biology
  • Sensory systems
  • Molecular evolution

Background:

  • Sensory receptors link organisms to their environment, acting as crucial sites for evolutionary innovation.
  • Understanding the evolutionary history of sensory receptors provides insights into the development of animal complexity.

Purpose of the Study:

  • To survey major sensory receptor families and identify evolutionary patterns.
  • To explore the mechanisms driving sensory receptor diversification and adaptation.
  • To examine the role of sensory receptors in speciation and the generation of animal diversity.

Main Methods:

  • Comparative analysis of major sensory receptor families.
  • Examination of evolutionary transitions from neurotransmitter to sensory receptors.
  • Identification of natural selection signatures in sensory receptor genes.

Main Results:

  • Receptors for touch, temperature, and light are ancient, predating multicellularity and nervous systems.
  • Chemoreceptors show dynamic evolutionary histories, with expansions and contractions linked to environmental complexity.
  • Independent evolutionary transitions from neurotransmitter receptors to sensory receptors for external stimuli were observed.

Conclusions:

  • Sensory receptor evolution is shaped by environmental interactions and lineage-specific adaptations.
  • Natural selection plays a key role in identifying novel sensory adaptations.
  • Sensory receptors are evolutionary hotspots that contribute significantly to reproductive isolation, speciation, and overall animal diversity.