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The anterior scalene (Latin: musculus scalenus anterior) is a muscle of the neck located in its lateral aspect. Therefore, this muscle is one of the lateral neck muscles. Together with the middle and posterior scalene muscles, it is classified as the scalene muscle. The anterior scalene lies behind the sternocleidomastoid.
|Anterior scalene muscle|
|Origin||Anterior tubercles of transverse processes of C3 - C6 vertebrae|
|Insertion||Superior border and anterior scalene tubercle of first rib|
Unilateral contractions - neck lateral flexion (ipsilateral), neck rotation (contralateral), elevation of first rib
Bilateral contractions - neck flexion
|Innervation||Anterior rami of 4th to 6th cervical spinal nerves (C4 - C6)|
|Blood supply||Ascending cervical artery|
The anterior scalene muscle originates from the anterior tubercles of the transverse processes of the 3rd to 6th cervical vertebrae (C3 - C6).
The insertion site of the anterior scalene is the superior border and anterior scalene tubercle of the first rib.
By contracting on both sides, the anterior scalene muscle flexes the neck. By contracting on one side, it bends the neck laterally to the same side (ipsilateral). Also, unilateral contractions provide contralateral neck rotation and elevation of the first rib.
The anterior scalene is innervated by the anterior rami of the 4th to 6th cervical spinal nerves (C4 - C6).
The anterior scalene muscle receives arterial blood supply from the ascending cervical branch of the inferior thyroid artery.