The head and neck are palpated for deep extension with contralateral rotation; which muscle is being palpated?

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The muscles being palpated are the scalene muscles. They sit deep on the lateral side of the neck, tucked beneath the sternocleidomastoid, and run from the cervical transverse processes to the first two ribs. When the head is extended and rotated to the opposite side, the scalene group becomes the prominent structure along the lateral neck as it stabilizes the neck and assists with rib elevation during inspiration. This deep, lateral location is what makes them the target in that specific palpation position.

The other muscles sit in different regions or are more superficial degrees of freedom during movement. The upper trapezius and levator scapulae are more posterior and superior and are typically palpated with different neck or shoulder actions. The sternocleidomastoid is a large, superficial muscle that is usually felt with general neck rotation rather than the deep, lateral strand felt during extension with contralateral rotation.