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Questions and Answers
What is the primary action of the Serratus Posterior Superior muscle?
What is the primary action of the Serratus Posterior Superior muscle?
- Flexes the shoulder
- Depresses the ribs
- Elevates the ribs (correct)
- Rotates the spine
Which spinal levels serve as the origin for the Serratus Posterior Superior?
Which spinal levels serve as the origin for the Serratus Posterior Superior?
- Spines of C3–C5
- Spines of C7–T3 (correct)
- Spines of T1-T5
- Spines of L1-L2
To which anatomical location does the Serratus Posterior Superior insert?
To which anatomical location does the Serratus Posterior Superior insert?
- Anterior surface of the sternum
- Inferior border of ribs 1–3
- Superior border of ribs 2–5 (correct)
- Lateral surface of the scapula
Which nerves are responsible for innervating the Serratus Posterior Superior?
Which nerves are responsible for innervating the Serratus Posterior Superior?
Which function would likely be impaired if the Serratus Posterior Superior were injured?
Which function would likely be impaired if the Serratus Posterior Superior were injured?
Flashcards
Serratus Posterior Superior
Serratus Posterior Superior
A muscle that elevates the upper ribs during respiration.
Origin of Serratus Posterior Superior
Origin of Serratus Posterior Superior
Spines of vertebrae C7 to T3 form the origin of this muscle.
Insertion of Serratus Posterior Superior
Insertion of Serratus Posterior Superior
Attaches to the superior border of ribs 2 to 5.
Action of Serratus Posterior Superior
Action of Serratus Posterior Superior
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Innervation of Serratus Posterior Superior
Innervation of Serratus Posterior Superior
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Study Notes
Serratus Posterior Superior Muscle Overview
- Primarily responsible for elevating the ribs.
- Originates from the spinous processes of vertebrae C7 to T3.
- Inserts onto the superior border of ribs 2 to 5.
Specific Anatomy
- Origin: Spines of C7-T3. This means the muscle begins on the bony projections (spinous processes) of the seventh cervical vertebra and the first three thoracic vertebrae.
- Insertion: Superior border of ribs 2-5. Meaning the muscle ends on the upper edge of ribs 2 through 5.
- Action: Elevates the ribs directly. This function is crucial in the mechanics of respiration.
Neurological Control
- Innervation: Intercostal nerves T2-T5 provide the motor input to the Serratus Posterior Superior. This indicates the nerves associated with the ribs in the upper chest area control its movement.
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