The scalene muscles are a group of three closely related neck muscles.
Summary
origin: transverse processes of mid to lower cervical vertebrae (C2-C7).
insertion: first or second ribs. The anterior and middle inserts on the first rib, whereas the posterior attaches on the second rib.
blood supply: ascending cervical artery
innervation: ventral rami of cervical nerves (C3-C8).
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action
accessory muscles of inspiration
unilateral: neck rotation
bilateral: lateral neck rotation and flexion