Podcast
Questions and Answers
What is the primary action of the interspinalis muscles?
What is the primary action of the interspinalis muscles?
- Extension of the neck and trunk (correct)
- Elevating the ribs
- Lateral flexion of the neck
- Hiking the hip
Which muscle is involved in the lateral flexion of the neck and trunk?
Which muscle is involved in the lateral flexion of the neck and trunk?
- Rectus abdominis
- Quadratus lumborum (correct)
- Levator costarum
- Interspinalis
What type of innervation does the levator costarum primarily receive?
What type of innervation does the levator costarum primarily receive?
- Dorsal primary rami (DPR) (correct)
- Thoracic spinal nerves
- Cervical spinal nerves
- Ventral primary rami (VPR)
Which of the following muscles is NOT innervated by dorsal primary rami (DPR)?
Which of the following muscles is NOT innervated by dorsal primary rami (DPR)?
What role does the quadratus lumborum play in the body's movement?
What role does the quadratus lumborum play in the body's movement?
Which root level is associated with the quadratus lumborum?
Which root level is associated with the quadratus lumborum?
Which muscle contributes to the mechanics of breathing by elevating the ribs?
Which muscle contributes to the mechanics of breathing by elevating the ribs?
Which type of nerve roots innervate the interspinalis muscles?
Which type of nerve roots innervate the interspinalis muscles?
Which of the following describes a characteristic of the segmental nature of these muscles?
Which of the following describes a characteristic of the segmental nature of these muscles?
Which muscle assists with hiking the hip?
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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