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Peripheral Nervous System: Ganglia and Nerves01:24

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The Peripheral Nervous System (PNS) is a crucial component of the body's neural network, extending beyond the central nervous system (CNS) to bridge the gap between the CNS and the external environment. It encompasses nerves, ganglia, and sensory receptors.
Nerves
The nerve is a bundle of axons that serves as the communication highway in the PNS. Each nerve is ensheathed in a protective layer of connective tissue called the epineurium. This outermost layer safeguards the nerve and supports the...
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Nervous Tissue: Neuron Types01:19

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Neurons, the fundamental units of the nervous system, can be classified based on both their structural and functional characteristics.
Structurally, neurons are categorized into three main types: multipolar, bipolar, and unipolar (or pseudounipolar). Multipolar neurons, which are the most common type in the brain and spinal cord, as well as all motor neurons, possess multiple dendrites and a single axon.
Bipolar neurons, on the other hand, have one primary dendrite and one axon. They are...
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Neurons: The Axon01:21

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
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Nervous Tissue: Myelin01:25

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
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Spinal Cord: Cross-sectional Anatomy01:16

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The cross-sectional anatomy of the spinal cord offers a detailed view of its complex structure and function within the central nervous system. At the core of the spinal cord lies the gray matter, characterized by its butterfly or "H"-shaped appearance in cross-section. This central region is enveloped by white matter, with the overall structure divided into symmetrical halves by the dorsal median sulcus and the ventral median fissure.
Gray Matter and its Components
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Spinal Nerves: Anatomy01:23

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Spinal nerves are pivotal conduits in the nervous system, bridging the central nervous system (CNS) with the peripheral nervous system (PNS). These nerves enable a complex communication network between the brain, spinal cord, and the rest of the body, facilitating sensory input, motor output, and autonomic functions.
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Related Experiment Video

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Three-Dimensional Motor Nerve Organoid Generation
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A conserved axon type hierarchy governing peripheral nerve assembly.

Liang Wang1, Alessandro Mongera, Dario Bonanomi

  • 1Developmental Neurobiology Laboratory, European Neuroscience Institute (ENI-G), Grisebachstraße 5, Göttingen 37077, Germany.

Development (Cambridge, England)
|April 5, 2014
PubMed
Summary

Peripheral nerve assembly in vertebrates is guided by a conserved hierarchy of axon extension and fasciculation. This process mirrors the evolutionary development of nerve circuits across fish, birds, and mammals.

Keywords:
Axon guidanceAxon-axon interactionsChickMotor neuronsMousePeripheral nerveSensory neuronsSympathetic neuronsZebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Peripheral nerves in gnathostome vertebrates (fish, birds, mammals) integrate motor and sensory functions.
  • Existing evidence suggests interactions between efferent and afferent axons guide nerve formation, but this is debated.

Purpose of the Study:

  • To investigate the conserved mechanisms governing peripheral nerve assembly in vertebrates.
  • To determine the role of axon type-specific interactions in nerve development.
  • To explore the evolutionary history of peripheral nerve formation.

Main Methods:

  • Utilized genetic modeling in zebrafish, chick, and mouse.
  • Analyzed axon type-dependent extension and selective fasciculation events.
  • Compared findings with the phylogenetic emergence of vertebrate nervous systems.

Main Results:

  • Discovered a conserved hierarchy of axon extension and fasciculation in peripheral nerve assembly.
  • Demonstrated that this hierarchy is dependent on specific axon types.
  • Showed that nerve assembly recapitulates evolutionary patterns of circuit development.

Conclusions:

  • Peripheral nerve formation follows a conserved, hierarchical process across diverse vertebrate species.
  • Axon type interactions play a crucial, instructive role in establishing peripheral nerve architecture.
  • The findings provide insights into the evolutionary developmental biology of the vertebrate nervous system.