Scapular Protraction and Serratus Anterior

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Questions and Answers

What is the primary muscle involved in scapular protraction?

  • Trapezius
  • Latissimus Dorsi
  • Serratus Anterior (correct)
  • Rhomboid Major

What is the typical range of motion for scapular protraction?

  • 5-6 fingers
  • 1-2 fingers
  • 2-3 fingers
  • 3-4 fingers (correct)

Which of the following factors limits the range of motion during scapular protraction?

  • Biceps femoris tension
  • Elevated arm position
  • Tension of the trapezius (correct)
  • Weakness of the serratus anterior

Which of the following best describes the effect of weakness in the serratus anterior?

<p>Winged scapula appearance (C)</p> Signup and view all the answers

What action does the serratus anterior primarily perform when pushing against a wall?

<p>Abduction and upward rotation of the scapula (A)</p> Signup and view all the answers

What nerve supplies the serratus anterior muscle?

<p>Long thoracic nerve (A)</p> Signup and view all the answers

What is the insertion point of the serratus anterior muscle?

<p>Costal surface of medial border of scapula (A)</p> Signup and view all the answers

During scapular protraction, the glenoid cavity of the scapula faces in which direction?

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

What is the approximate range of motion for scapular protraction in terms of finger spaces?

<p>3 - 4 fingers (D)</p> Signup and view all the answers

What condition may result from weakness of the serratus anterior muscle?

<p>Winging of the scapula (B)</p> Signup and view all the answers

Which of the following factors limits the range of motion of scapular protraction?

<p>Tension of trapezius and rhomboids (A)</p> Signup and view all the answers

What action does the serratus anterior facilitate when pushing against a wall?

<p>Displacement of the thorax posteriorly (B)</p> Signup and view all the answers

Which of the following statements is true regarding the action of the serratus anterior?

<p>It holds the medial border of the scapula against the thorax. (C)</p> Signup and view all the answers

What is the origin location of the serratus anterior muscle?

<p>Outer surfaces of upper ribs (B)</p> Signup and view all the answers

Flashcards

Scapular Protraction

The movement of the scapula forward away from the spine.

Serratus Anterior Muscle

A muscle that primarily protracts (pulls forward) the scapula.

Winged Scapula

Abnormal position of the scapula, where it protrudes from the back due to serratus anterior weakness or paralysis.

Range of Motion (ROM) - Scapular Protraction

About 3-4 finger widths of forward movement.

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Trapezius and Rhomboids

Muscles that contribute to limiting the range of scapular protraction.

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Long Thoracic Nerve

The nerve that controls the serratus anterior muscle.

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Scapular Abduction

Another term for scapular protraction. The movement of the shoulder blade away from the spine.

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Scapular Upward Rotation

The movement of the scapula upward.

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Serratus Anterior

Primary muscle responsible for scapular protraction.

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Limiting Factors (Scapular Protraction)

Ligaments and muscles (trapezius, rhomboids) that restrict the movement of scapula.

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Origin of Serratus Anterior

Outer surfaces and upper borders of upper eight or nine ribs.

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Insertion of Serratus Anterior

Costal surface of medial border of the scapula.

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Action of Serratus Anterior

Displaces the scapula, abducts, and upward rotates it, holding the medial scapular border against the thorax.

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Study Notes

Scapular Protraction

  • Muscles Involved: Serratus anterior
  • Origin: Upper 8-9 ribs
  • Insertion: Medial border of the scapula
  • Range of Motion: Abduction of the scapula is approximately equivalent to the space of 3-4 fingers.
  • Action: Abduction, upward rotation of the scapula; holds the medial border of the scapula against the thorax; upper fibers elevate the scapula and lower fibers depress it; assists in moving the thorax posteriorly when pushing away from objects (e.g., a wall).
  • Limiting Factors: Tension in the trapezoid ligament, trapezius, and rhomboid major/minor, restrict forward rotation of the scapula on the clavicle.

Weakness of Serratus Anterior

  • Winged Scapula: Weakness or paralysis leads to an abnormal scapular position, where the scapula protrudes from the back.
  • Functional Impact: Reduced ability to lift, pull, and push objects; difficulty with changing clothes or washing hair.

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