Sternocleidomastoid – Essentials

Actions

• Flexes head and neck
• Laterally flexes head and neck
• Rotates head and neck (opposite side)
• Elevates thorax aiding inspiration

Origin

• Manubrium of sternum (sternal head)
• Medial clavicle (clavicular head)

Insertion

• Mastoid process of temporal bone
• Superior nuchal line

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