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Obliquus Capitis Inferior

Region

Origin & Insertion

['Origin: Spinous process of C2', 'Insertion: Transverse process of C1']

Synergistic Muscles

['Obliquus capitis superior', 'Rectus capitis posterior major']

Joints

['Atlanto-axial joint']

Primary Actions

['Ipsilateral rotation of head']

Nerve & Spinal Segment

Suboccipital nerve (C1 dorsal ramus)

No plexus; C1 dorsal root

Interesting

Does not attach to skull; pure rotator. [Moore's]

Reversal of Action

Anchor C1 to rotate skull

Common Dysfunctions

Neck tightness, limited head rotation

How to Stretch

Rotate head to opposite side and gently flex.

Trigger Points

How to Strengthen

Isometric rotation exercises.

Concentric Action

Rotate atlas on axis (C1–C2 rotation)

Applications:

C1–C2 mobility key in cervicogenic headache treatment

Eccentric Action

Control return from cervical rotation

Isotonic Action

Gentle head turns while prone

Related Conditions

['Cervicogenic headaches', 'Atlanto-axial instability']

Isometric Action

Hold head rotated with deep focus

Exercise Ideas

['C1-C2 glide drills', 'Resisted rotation', 'Head nod with rotation']

Spry Juncture, LLC

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