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Related Concept Videos

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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Naming Skeletal Muscles01:19

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The naming of the approximately 700 muscles in the human body is based on a set of criteria designed to provide descriptive information about each muscle, making it easier to identify and remember them.
The key factors used in naming muscles include:
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Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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Axial and Appendicular Muscles01:18

Axial and Appendicular Muscles

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Skeletal muscles, the key players in our body's movement, can be classified into two groups based on their location and function: axial muscles and appendicular muscles. These classifications reflect the primary roles the muscles play in the body's structure and movement.
Axial Muscles
Axial muscles, situated along the body's midline, are intricately connected to the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles facilitate facial expressions and...
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Structure and Organization of Smooth Muscles01:13

Structure and Organization of Smooth Muscles

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Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
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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 7, 2025

Contractility Measurements on Isolated Papillary Muscles for the Investigation of Cardiac Inotropy in Mice
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Papillary muscles: morphological differences and their clinical correlations.

Neha Xalxo1, Simarpreet Kaur2, Mohit Chauhan3

  • 1Department of Anatomy, All India Institute of Medical Sciences Rajkot, Rajkot, India.

Anatomy & Cell Biology
|November 18, 2024
PubMed
Summary
This summary is machine-generated.

Papillary muscle (PM) morphology differs between heart ventricles. This study found distinct shapes and numbers in the right and left ventricles, crucial for cardiac interventions.

Keywords:
Chordae tendinaeMitral valveMyocardial diseasesPapillary musclesTricuspid valve

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Last Updated: Jun 7, 2025

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Area of Science:

  • Cardiac Anatomy
  • Cardiovascular Morphology
  • Ventricular Anatomy

Background:

  • The papillary muscles (PMs) are integral to cardiac function and disease.
  • Understanding PM morphology is vital for cardiothoracic interventions.
  • Comparative analysis of PMs in the right and left ventricles is limited.

Purpose of the Study:

  • To comparatively analyze papillary muscle (PM) morphology in human right and left ventricles.
  • To investigate differences in PM number, location, and shape between ventricles.
  • To identify unique PM configurations and their implications for cardiac procedures.

Main Methods:

  • Dissection of 38 grossly normal human hearts from donated bodies.
  • Systematic observation and recording of papillary muscle (PM) number, location, and shape.
  • Comparative analysis of PM morphology between the sternocostal and diaphragmatic surfaces of both ventricles.

Main Results:

  • Left ventricle: Predominantly single PM (71.05% sternocostal, 57.89% diaphragmatic); broad-based shape most common.
  • Right ventricle: Higher prevalence of single PM (89.47% sternocostal, 63.16% diaphragmatic); conical shape predominated.
  • Unique findings: 'H'/'b' shapes, conjoint PMs (left), small projections (right), and webbed PM (right, one specimen).

Conclusions:

  • Significant variability exists in papillary muscle (PM) morphology between the right and left ventricles.
  • Distinct shapes and prevalence of single vs. multiple PMs are observed in each ventricle.
  • Detailed knowledge of PM architecture is essential for cardiothoracic surgeons, radiologists, and cardiologists.