Anatomy
Origin:
Posterior tubercles of the transverse processes of C4 to C7.
Insertion:
Upper surface of the 2nd rib, posterior to the attachment of serratus anterior.
Key Relations:
Smallest and deepest of the scalenes.
Functions
-Elevates the 2nd rib.
-Lateral flexes the neck to the same side.
-An accessory muscle of inspiration.
Supply
Nerve Supply:
Anterior rami of C5 to C7.
Blood Supply:
Ascending cervical artery arising from the inferior thyroid artery.
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