Questions and Answers
What is the primary action of the interspinalis muscles?
Which muscle is involved in the lateral flexion of the neck and trunk?
What type of innervation does the levator costarum primarily receive?
Which of the following muscles is NOT innervated by dorsal primary rami (DPR)?
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What role does the quadratus lumborum play in the body's movement?
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Which root level is associated with the quadratus lumborum?
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Which muscle contributes to the mechanics of breathing by elevating the ribs?
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Which type of nerve roots innervate the interspinalis muscles?
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Which of the following describes a characteristic of the segmental nature of these muscles?
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Which muscle assists with hiking the hip?
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Study Notes
Muscle Structure and Function
- Interspinalis muscles: Aid in extending both the neck and trunk.
- Intertransversarii muscles: Facilitate lateral flexion of the neck and trunk.
- Levator costarum muscles: Elevate ribs, playing a key role in the mechanics of breathing.
- Quadratus lumborum: Involved in ipsilateral side bending of the trunk and assists in hiking the hip.
Innervation and Nerve Roots
- Interspinalis: Innervated by dorsal primary rami (DPR).
- Intertransversarii: Also innervated by dorsal primary rami (DPR).
- Levator costarum: Primarily innervated by dorsal primary rami (DPR).
- Quadratus lumborum: Innervated by ventral primary rami (VPR) and subcostal nerve, with root levels mainly including T12.
Segmental Information
- The muscle innervation and actions are segmental, particularly associated with the thoracic and lumbar spinal regions, focusing on segment T12.
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Description
Test your knowledge on the structure and function of muscles involved in neck and trunk movement. This quiz covers the roles and innervation of key muscle groups such as the Interspinalis, Intertransversarii, Levator costarum, and Quadratus lumborum. Assess your understanding of biomechanics and muscle functionality.
