Week #22 - SCM

Oct 02, 2026

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Greetings,

Welcome to the 22nd week of the Wellness & Lifestyle Guide. Today, our message is on the anatomical structure Sternocleidomastoid (SCM) muscle.

Source #1:

https://en.wikipedia.org/wiki/Sternocleidomastoid_muscle

Focus Point #1 - Overview:

"The sternocleidomastoid muscle is one of the largest and most superficial cervical muscles. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck.^[3] "

Focus Point #2 - Nerve Supply:

"The sternocleidomastoid is innervated by accessory nerve of the same side.^[7]^[8] It supplies only motor fibres."

Focus Point #3 - Function:

"The function of this muscle is to rotate the head to the opposite side or obliquely rotate the head.^[4] It also flexes the neck.^[4] When both sides of the muscle act together, it flexes the neck and extends the head. When one side acts alone, it causes the head to rotate to the opposite side and flexes laterally to the same side (ipsilaterally).

It also acts as an accessory muscle of respiration, along with the scalene muscles of the neck."

Until next time,

Neck Health

Master Your Habits ©

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www.neck-health.com

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Week #22 - SCM

Focus Point #1 - Overview:

Focus Point #2 - Nerve Supply:

Focus Point #3 - Function:

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