Questions and Answers
What is the primary action of the interspinalis muscle?
Which nerve roots are associated with the quadratus lumborum?
What action is primarily associated with the levator costarum muscle?
Which of the following muscles is responsible for ipsilateral side bending of the trunk?
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The intertransversarii muscle primarily assists in which of the following actions?
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What is the primary nerve root associated with the intertransversarii muscle?
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Which muscle primarily assists in neck and trunk lateral flexion?
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What action is primarily associated with the quadratus lumborum muscle?
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Which muscle is involved in aiding neck and trunk extension?
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Which muscle contributes to rib elevation?
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Study Notes
Muscle Structure and Function
- Interspinalis muscles assist in extending the neck and trunk.
- Intertransversarii muscles are involved in lateral flexion of the neck and trunk.
- Levator costarum muscles elevate the ribs, contributing to breathing mechanics.
- Quadratus lumborum plays a role in ipsilateral side bending of the trunk and helps hike the hip.
Innervation and Nerve Roots
- Interspinalis is innervated by dorsal primary rami (DPR).
- Intertransversarii also receives innervation from dorsal primary rami (DPR).
- Levator costarum is primarily innervated by the dorsal primary rami (DPR).
- Quadratus lumborum is innervated by the ventral primary rami (VPR) and subcostal nerve.
- Root levels for the quadratus lumborum include T12.
Segmental Information
- The innervation and actions of these muscles are segmental in nature, primarily associated with thoracic and lumbar spinal regions, particularly T12.
Muscle Structure and Function
- Interspinalis muscles assist in extending the neck and trunk.
- Intertransversarii muscles are involved in lateral flexion of the neck and trunk.
- Levator costarum muscles elevate the ribs, contributing to breathing mechanics.
- Quadratus lumborum plays a role in ipsilateral side bending of the trunk and helps hike the hip.
Innervation and Nerve Roots
- Interspinalis is innervated by dorsal primary rami (DPR).
- Intertransversarii also receives innervation from dorsal primary rami (DPR).
- Levator costarum is primarily innervated by the dorsal primary rami (DPR).
- Quadratus lumborum is innervated by the ventral primary rami (VPR) and subcostal nerve.
- Root levels for the quadratus lumborum include T12.
Segmental Information
- The innervation and actions of these muscles are segmental in nature, primarily associated with thoracic and lumbar spinal regions, particularly T12.
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Description
Test your knowledge on the structure, function, and innervation of key muscles, including interspinalis, intertransversarii, levator costarum, and quadratus lumborum. This quiz also covers their roles in neck and trunk movements as well as their nerve supply associated with thoracic and lumbar regions.
