Sternocleidomastoid - Muscle Physiology & Functional Anatomy

 

Sternocleidomastoid Muscle

Anatomy

 

Origin:

  • Manubrium sterni, medial portion of the clavicle

Insertion:

  • Mastoid process of the (temporal bone) skull, superior nuchal line



Major Arteries:

  • Occipital artery

  • Superior thyroid artery

 

Neural Innervation:

  • Acessory nerve C1-C5 (motor function)

  • Cervical plexus (sensory function)

 

Trigger Points:

Trigger Points of the SternocleidomastoidSternocleidomastoid Trigger Points

 

Physiology

 

Concentric Functions:

  • Flexion, rotation, lateral flexion of the (cervical spine) neck

  • Flexion, rotation, lateral flexion & extension of the (atlantooccipital & atlantoaxial) head

 

Eccentric Functions:

  • Decelerates lateral flexion, rotation & flexion of the cervical spine

 

Isometric Function:

  • Dynamically stabilizes the cervical spine during functional movements

 

Related Muscles

 

Antagonists:

 

Exercises:


More Images of the Sternocleidomastoid Muscle

 

Sternocleidomastoid and neck

Sternocleidomastoid

Sternocleidomastoid Muscle


More Information about the Sternocleidomastoid Muscle

The sternocleiodmastoid muscle is commonly abbreviated as SCM.  In addition to its movement functions, this paired muscle aids in inspiration along with the scalene muscles.

The sternocleidomastoid muscle is named so because of its anatomy.  Since it originates at the manubrium of the sternum (sterno) & the clavicle (cleido) and inserts at the mastoid process (mastoid).

 

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