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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.
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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.
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The craniofacial muscles are a collection of approximately 20 thin skeletal muscles situated beneath the skin of the face and scalp. These muscles, primarily responsible for the vast array of human facial expressions, originate from the bones or fibrous structures of the skull and extend outwards to connect with the skin. While most skeletal muscles in the body are enveloped in thick fascia, facial muscles generally have a more delicate fascial covering, with the buccinator muscle being a...
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Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
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Functions of Smooth Muscles01:23

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Smooth muscles are an important type of muscle tissue that plays a vital role in the involuntary movements of internal organs. For example, they help regulate the movement of food through the gut and the flow of blood through the circulatory system.
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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.
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Updated: May 27, 2025

Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
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Jaw-Muscle Structure and Function in Primates: Insights Into Muscle Performance and Feeding-System Behaviors.

Andrea B Taylor1, Megan A Holmes2, Myra F Laird3

  • 1Department of Foundational Biomedical Sciences, Touro University California, Vallejo, California, USA.

Evolutionary Anthropology
|February 18, 2025
PubMed
Summary
This summary is machine-generated.

Primate jaw muscles vary in fiber type and architecture, influencing feeding and social behaviors. Understanding this variation is crucial for studying primate mastication and evolution, especially in paleobiology.

Keywords:
bite forcefiber architecturefiber typefossil homininsgapemasticatory musclesphylogeny

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A Minimally Invasive Lesion Technique for Muscles Intrinsic to the Odontophore of Aplysia californica
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Area of Science:

  • Primate anatomy and physiology
  • Paleobiology
  • Biomechanics

Background:

  • Jaw-adductor muscles are key to primate feeding (biting, chewing) and social signaling (canine display).
  • Research on primate chewing muscles has increased to understand their functional and evolutionary significance.
  • The masticatory apparatus in primates is complex and warrants detailed study.

Purpose of the Study:

  • To review variations in jaw-adductor muscle fiber types and architecture across primates.
  • To correlate these variations with physiological, architectural, and behavioral performance.
  • To highlight the utility of this data in paleobiological research, using fossil hominins as an example.

Main Methods:

  • Literature review of studies on primate jaw-adductor muscles.
  • Analysis of physiological variables (specific tension, fatigue resistance).
  • Examination of architectural variables (muscle stretch, gape) and biomechanical performance (bite force).

Main Results:

  • Significant variation exists in jaw-adductor muscle fiber types and architecture among primate species.
  • These variations impact performance variables like muscle force, fatigue resistance, and gape.
  • Morphological variation is influenced by sex, age, muscle, and species.

Conclusions:

  • Primate jaw muscle morphology and performance exhibit substantial variation.
  • Future research should consider ranges of performance variables due to high morphological diversity.
  • Understanding jaw muscle variation is essential for reconstructing primate feeding ecology and evolution.