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Questions and Answers
What is the primary muscle involved in scapular protraction?
What is the primary muscle involved in scapular protraction?
What is the typical range of motion for scapular protraction?
What is the typical range of motion for scapular protraction?
Which of the following factors limits the range of motion during scapular protraction?
Which of the following factors limits the range of motion during scapular protraction?
Which of the following best describes the effect of weakness in the serratus anterior?
Which of the following best describes the effect of weakness in the serratus anterior?
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What action does the serratus anterior primarily perform when pushing against a wall?
What action does the serratus anterior primarily perform when pushing against a wall?
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What nerve supplies the serratus anterior muscle?
What nerve supplies the serratus anterior muscle?
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What is the insertion point of the serratus anterior muscle?
What is the insertion point of the serratus anterior muscle?
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During scapular protraction, the glenoid cavity of the scapula faces in which direction?
During scapular protraction, the glenoid cavity of the scapula faces in which direction?
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What is the approximate range of motion for scapular protraction in terms of finger spaces?
What is the approximate range of motion for scapular protraction in terms of finger spaces?
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What condition may result from weakness of the serratus anterior muscle?
What condition may result from weakness of the serratus anterior muscle?
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Which of the following factors limits the range of motion of scapular protraction?
Which of the following factors limits the range of motion of scapular protraction?
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What action does the serratus anterior facilitate when pushing against a wall?
What action does the serratus anterior facilitate when pushing against a wall?
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Which of the following statements is true regarding the action of the serratus anterior?
Which of the following statements is true regarding the action of the serratus anterior?
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What is the origin location of the serratus anterior muscle?
What is the origin location of the serratus anterior muscle?
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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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Description
This quiz covers the anatomy and function of the serratus anterior muscle, including its role in scapular protraction. It discusses the muscle's origin, insertion, range of motion, and the consequences of weakness, such as winged scapula. Test your knowledge on the functional implications and limiting factors related to this critical muscle.
