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What happens when both left and right sternocleidomastoid muscles are contracted?.

User Luanjot
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1 Answer

16 votes
16 votes

This extension movement brings the head backward. A contraction of both SCM muscles can flex your neck, which brings your chin down in the direction of your breastbone. Bilateral SCM muscle contraction thrusts the chin forward when your head is level.

User Jacob Wan
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