Action of spinalis cervicis?

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Multiple Choice

Action of spinalis cervicis?

Explanation:
The key idea is that spinalis cervicis is a deep intrinsic back muscle that runs along the spine to help straighten and extend the neck. When both sides contract, it pulls the upper and lower spine closer together, producing extension of the cervical region (bringing the head and neck back to an upright position from a flexed or hunched posture). This makes extending the cervical spine its primary action. Flexion of the neck is carried out mainly by front-lying muscles like the sternocleidomastoid and some deep anterior muscles, not by the spinalis cervicis. Lateral flexion and head rotation are largely produced by other muscles that attach to the skull or sit more laterally, so spinalis cervicis doesn’t serve as the principal mover for those movements.

The key idea is that spinalis cervicis is a deep intrinsic back muscle that runs along the spine to help straighten and extend the neck. When both sides contract, it pulls the upper and lower spine closer together, producing extension of the cervical region (bringing the head and neck back to an upright position from a flexed or hunched posture). This makes extending the cervical spine its primary action.

Flexion of the neck is carried out mainly by front-lying muscles like the sternocleidomastoid and some deep anterior muscles, not by the spinalis cervicis. Lateral flexion and head rotation are largely produced by other muscles that attach to the skull or sit more laterally, so spinalis cervicis doesn’t serve as the principal mover for those movements.

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