In upper cross syndrome, which muscle group is typically inhibited?

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In upper cross syndrome, the deep cervical flexors are typically inhibited. These deep neck muscles, like longus capitis and longus coli, provide important segmental stability and controlled, smooth cervical flexion. When posture shifts to forward head and rounded shoulders, these stabilizers are dimished in their activity due to altered neural recruitment and reciprocal inhibition from tight chest and upper back muscles. As a result, the neck relies more on superficial muscles such as the sternocleidomastoid and even the upper trapezius, which become overactive. The listed tight/overactive muscles fit the syndrome pattern, whereas the deep cervical flexors are the ones that are underactive.