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Related Concept Videos

Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

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Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
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Overview of Skeletal Muscle01:15

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
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Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
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Gross Anatomy of Skeletal Muscles01:12

Gross Anatomy of Skeletal Muscles

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The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
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Related Experiment Video

Updated: Jun 12, 2025

A Rapid Automated Protocol for Muscle Fiber Population Analysis in Rat Muscle Cross Sections Using Myosin Heavy Chain Immunohistochemistry
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Differences in muscle composition and functionality: Exploring CT anatomical points and SARC-F components.

Janaína Oliveira de Araújo1, Maria Karolainy do Nascimento1, Amanda de Sousa Rebouças1

  • 1Postgraduate Program in Health Sciences, Health Sciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil.

Nutrition (Burbank, Los Angeles County, Calif.)
|September 24, 2024
PubMed
Summary
This summary is machine-generated.

This study found that poor muscle composition, indicated by lower skeletal muscle radiodensity (SMD), is linked to higher sarcopenia risk in cancer patients. Lower SMD at specific body sites correlated with SARC-F questionnaire results.

Keywords:
Anatomical landmarksMuscle massMuscle qualityMuscle radiodensitySarcopenia screening

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

  • Oncology
  • Geriatrics
  • Radiology
  • Nutrition

Background:

  • Sarcopenia, characterized by muscle loss and weakness, significantly impacts cancer patient outcomes.
  • The SARC-F questionnaire is a screening tool for sarcopenia, but its correlation with objective muscle parameters needs further investigation.
  • Computed tomography (CT) scans offer detailed insights into muscle composition and morphology.

Purpose of the Study:

  • To investigate differences in muscle parameters across SARC-F components in cancer patients.
  • To explore the relationship between SARC-F scores and muscle parameters using CT-derived landmarks.
  • To assess skeletal muscle (SM) cross-sectional area, SM index, and SM radiodensity (SMD) in relation to sarcopenia indicators.

Main Methods:

  • Cross-sectional analysis of 128 cancer patients with available CT scans.
  • SARC-F questionnaire administered to assess muscle functionality (score ≥4 indicating poor status).
  • CT measurements of SM cross-sectional area, SM index, and SMD at L3, thigh, and gluteal regions.

Main Results:

  • Patients with SARC-F scores ≥4 showed significantly lower SMD across all assessed landmarks.
  • Lower SMD at L3 was associated with difficulties in strength, walking, and stair climbing.
  • Lower SMD at gluteal and thigh levels was linked to stair-climbing difficulties.
  • SMD at the gluteal level was independently associated with the overall SARC-F score.

Conclusions:

  • Poor muscle composition, evidenced by lower SMD, is associated with higher risk of sarcopenia in cancer patients.
  • CT-derived muscle parameters, particularly SMD, can identify individuals at risk for poor muscle functionality.
  • These findings highlight the utility of CT imaging in assessing sarcopenia in oncology settings.