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scalenes Anatomy Origin: • Anterior: Transverse processes of cervical vertebrae C3-C6 • Medial: Transverse processes of cervical vertebrae C2-C7 • Posterior: Transverse processes of cervical vertebrae C5-C6 Insertion: • Anterior: 1st rib • Medial: 1st rib • Posterior: 2nd rib Major Arteries: • Ascending cervical artery • Branch of inferior thyroid artery Neural Innervation: • Cervical nerves C3-C8 Physiology Concentric Functions: • Flexion & rotation of the (cervical spine) neck • Accelerates lateral flexion of the (cervical spine) neck Eccentric Functions: • Decelerates lateral flexion of cervical spine, cervical rotation & extension Isometric Function: • Dynamic stabilization of the spine during functional movements
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