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Related Concept Videos

The Neuromuscular Junction01:19

The Neuromuscular Junction

The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
Neurons: The Cell Body and the Dendrites01:23

Neurons: The Cell Body and the Dendrites

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...
The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Neurons: The Axon

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.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment.
Mitochondria01:37

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Neurons as Communicators of the Brain01:22

Neurons as Communicators of the Brain

Neurons, the fundamental units of the brain and nervous system, function as the primary transmitters of information throughout the body. Their ability to communicate through electrical and chemical signals is vital for every bodily function, from regulating the heartbeat to processing complex thoughts. Each neuron has three main components: the cell body (soma), dendrites, and an axon, each specialized to facilitate swift and efficient neural communication.
Cell Body
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Related Experiment Video

Updated: May 16, 2026

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
08:41

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Published on: August 14, 2021

Aging and muscle: a neuron's perspective.

Todd M Manini1, S Lee Hong, Brian C Clark

  • 1Institute of Aging and the Department of Aging and Geriatric Research, University of Florida, Gainesville, Florida 32611, USA. tmanini@ufl.edu

Current Opinion in Clinical Nutrition and Metabolic Care
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Age-related muscle weakness stems from nervous system decline, not just muscle atrophy. Brain and nerve impairments disrupt neural communication, contributing to reduced strength in older adults.

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Published on: August 14, 2021

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Dissection and Immunohistochemistry of the Drosophila Adult Leg to Detect Changes at the Neuromuscular Junction for an Identified Motor Neuron
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Area of Science:

  • Neuroscience
  • Gerontology
  • Skeletal Muscle Physiology

Background:

  • Age-related muscle weakness presents significant societal and personal costs.
  • Traditional research focused on intrinsic muscle factors, overlooking neural contributions.

Purpose of the Study:

  • To review age-related changes in the brain and peripheral nervous system.
  • To explore their theoretical contribution to age-related muscle weakness.

Main Methods:

  • Review of existing literature on aging, neuroscience, and muscle physiology.
  • Synthesis of findings on neuronal and neuromuscular changes with age.

Main Results:

  • Brain: Neuronal atrophy, increased electrical noise, impaired sensorimotor feedback loops.
  • Peripheral Nervous System: Motor unit loss, axonal atrophy, demyelination, altered neuromuscular junction signaling.

Conclusions:

  • Muscle weakness in aging is multifactorial, involving nervous system degradation.
  • Impaired neural signaling to muscles contributes to sarcopenia.
  • Future research should investigate the direct link between neurological adaptations and muscle weakness to develop targeted interventions.