Muscle Shapes Flashcards

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Questions and Answers

What type of muscles are described as wider in the center and taper off at the ends?

  • Parallel Muscles
  • Triangular Muscles
  • Pennate Muscles
  • Fusiform Muscles (correct)

What is an example of fusiform muscle architecture?

Biceps brachii

Parallel muscles have fibers that are perpendicular to the force-generating axis.

False (B)

Name an example of parallel muscles.

<p>Sartorius or Sternocleidomastoid</p> Signup and view all the answers

What is a defining feature of triangular (convergent) muscles?

<p>The origin is wider than the point of insertion.</p> Signup and view all the answers

Provide an example of a triangular (convergent) muscle.

<p>Pectoralis Major</p> Signup and view all the answers

What characterizes pennate muscles?

<p>Fibers are at an angle to the force-generating axis.</p> Signup and view all the answers

Name an example of a pennate muscle.

<p>Deltoid muscle</p> Signup and view all the answers

What is the shape of circular muscles?

<p>Circular</p> Signup and view all the answers

Which of the following is an example of a circular muscle?

<p>Obicularis Oris (D)</p> Signup and view all the answers

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Study Notes

Muscle Shapes

  • Fusiform Muscles

    • Characterized by a spindle shape, wider in the center and tapering at the ends.
    • The line of action runs straight between attachment points, usually tendons.
    • Force generated is concentrated in a small area.
    • Example: Biceps brachii.

  • Parallel Muscles

    • Muscle fibers run parallel to the force-generating axis.
    • Ideal for fast and extensive movements.
    • Measured by anatomical cross-sectional area.
    • Examples: Sartorius and Sternocleidomastoid.

  • Triangular (Convergent) Muscles

    • Origin is broader than the insertion point, allowing maximum force production.
    • Fiber arrangement contributes to effective force generation.
    • Example: Pectoralis Major.

  • Pennate Muscles

    • Fibers are arranged at an angle to the force-generating axis (known as pennation angle).
    • Fibers typically insert into a central tendon.
    • Example: Deltoid muscle in the shoulder.

  • Circular Muscles (Sphincters)

    • Circular muscle shape, functioning as sphincters surrounding openings.
    • Control passage through openings in the body.
    • Examples: Obicularis Oris (surrounding the mouth) and Obicularis Oculi (surrounding the eyes).

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