Anatomy
Origin:
Spinous process of axis.
Insertion:
Middle third of inferior nuchal line.
Key Relations:
Forms the superior and medial border of the suboccipital triangle.
Functions
-Acts bilaterally to extend the head at the atlanto-occipital joint.
-Acts unilaterally to rotate the head to the same side at the atlanto-occipital joint.
Supply
Innervation:
Suboccipital nerve (C1).
Blood supply:
Muscular branches of vertebral artery.
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