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Related Concept Videos

Neurons: The Cell Body and the Dendrites01:23

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A typical nerve cell comprises three main components: the cell body, dendrites, and the axon. The cell body, also known as the soma or perikaryon, serves as the central biosynthetic hub housing a nucleus surrounded by cytoplasm containing organelles commonly found in most cells. Notably, Nissl bodies, clusters of the rough endoplasmic reticulum and free ribosomes responsible for protein synthesis, are distinctive features of the neuronal cell body. As neurons age, aggregates of a brown pigment...
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The Synapse02:47

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Overview of Synapses01:25

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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The spinal cord, a critical component of the central nervous system, extends from the base of the brainstem to the lumbar region of the vertebral column. It is essential for maintaining physical stability and facilitating communication between the brain and peripheral parts of the body.
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Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
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Updated: Apr 22, 2026

Author Spotlight: Optimizing Dendritic Spine Analysis for Balanced Manual and Automated Assessment in the Hippocampus CA1 Apical Dendrites
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The spine problem: finding a function for dendritic spines.

Sarah Malanowski1, Carl F Craver1

  • 1Department of Philosophy, Washington University in St. Louis St. Louis, MO, USA.

Frontiers in Neuroanatomy
|October 14, 2014
PubMed
Summary
This summary is machine-generated.

Understanding why neurons have dendritic spines requires examining their causal role in neural mechanisms. This study proposes a framework to empirically answer "why" questions about spines by analyzing their specific contributions.

Keywords:
causal-mechanical explanationdendritic spinesfunctionfunctional attributionmechanisms

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Area of Science:

  • Neuroscience
  • Philosophy of Science

Background:

  • Dendritic spines are crucial neuronal structures, but their precise functional significance remains a key question in neuroscience.
  • The 'spine problem' highlights the challenge of empirically answering why-questions regarding these complex cellular components.

Purpose of the Study:

  • To provide a framework for empirically answering why-questions about dendritic spines.
  • To reframe 'why' questions as inquiries into the causal impact of spines on neuronal mechanisms.

Main Methods:

  • Conceptual analysis of 'why-questions' in a scientific context.
  • Defining 'making a difference' in terms of causal contributions to a mechanism.
  • Categorizing four distinct ways a component can influence a mechanism (necessary, modulatory, component, background condition).

Main Results:

  • Why-questions about dendritic spines can be answered empirically by assessing their causal role.
  • A component's "difference-making" can be understood through its specific contribution to a mechanism's function.
  • Four distinct categories of causal influence (necessary, modulatory, component, background condition) were identified with their evidential requirements.

Conclusions:

  • The study offers a systematic approach to address the 'spine problem' and similar questions in neuroscience.
  • Understanding dendritic spines requires analyzing their specific causal contributions within the broader neural mechanism.
  • There are multiple 'spine problems,' each potentially having diverse, empirically supported answers.