Anatomy
Origin:
Transverse process of the atlas.
Insertion:
Lateral half of inferior nuchal line to superior nuchal line.
Key Relations:
Forms the superior and lateral border of the suboccipital triangle.
Functions
-Acts bilaterally to extend the head at the atlanto-occipital joint
-Acts unilaterally to flex the head to the ipsilateral side.
Supply
Innervation:
Suboccipital nerve (C1).
Blood supply:
Muscular branches of vertebral artery.
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