Spenius Capitis Muscle
Origin:
Lower half of the nuchal ligament, the spinous processes and supraspinous ligaments of C7 to T3
Insertion: Lateral occipital bone, between the superior and inferior nuchal lines
Actions: Extension of the head and cervical spine when acting bilaterally
Innervation: Dorsal primary rami of C3 to C5
Blood Supply: Descending branches of the occipital artery and the superior intercostal artery
Primary Actions of the Splenius Capitis
1. Extension of the head and cervical spine when acting bilaterally
Agonists:
- Longissimus Capitis
- Spinalis Capitis
- Semispinalis Capitis
- Sternocleidomastoid
Antagonists:
- Longus Capitis
- Sternocleidomastoid (anterior fibers)
2. Lateral flexion of the head and cervical spine when acting unilaterally
Agonists:
- Sternocleidomastoid
Antagonists:
- Sternocleidomastoid on the opposite side
Semispinalis capitis assists with lateral flexion of the head and cervical spine.
3. Assists with ipsilateral rotation of the head and cervical spine when acting unilaterally
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For Pain and Symptom Information See: Splenius Capitis: Pain at the Top of the Head
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For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!