Action of Splenius cervicis.

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Multiple Choice

Action of Splenius cervicis.

Explanation:
Splenius cervicis is a deep neck muscle whose fibers run from the lower thoracic spine up to the upper cervical vertebrae. When both sides contract, it helps extend the head and neck. When it contracts on one side, it rotates the head to the same side and assists with lateral flexion. This orientation of origin and insertion makes extension plus ipsilateral rotation the natural actions of this muscle, which is why it fits the description “Extends the head/neck; rotates to the same side.” It doesn’t flex the trunk, elevate the ribs, or abduct the scapula, which are actions of other muscle groups.

Splenius cervicis is a deep neck muscle whose fibers run from the lower thoracic spine up to the upper cervical vertebrae. When both sides contract, it helps extend the head and neck. When it contracts on one side, it rotates the head to the same side and assists with lateral flexion. This orientation of origin and insertion makes extension plus ipsilateral rotation the natural actions of this muscle, which is why it fits the description “Extends the head/neck; rotates to the same side.” It doesn’t flex the trunk, elevate the ribs, or abduct the scapula, which are actions of other muscle groups.

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