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Neck Muscle Anatomy

A look at the Sternocleidomastoidand Scalenes

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Your neck muscles

are amazing. They areresponsible for headmovement, stabilizingtheupper region of the body,

assistingin swallowing,helping to elevatethe ribcage during inhalation, andmore.

Lets take a look!

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There are 26musclesin the neck--10 pairsof 2 and 2 sets of 3,

to be precise.

- Sterncleidomastoid- Scalenes- Platysma- Digastric- Omohyoid- Sternohyoid

- Sternothyroid- Mylohyoid- Stylohyoid- Geniohyoid- Thyrohyoid

(And a partridge in a pear tree.)

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The neck muscles attachto various bones of theskull, spine, thoracic cage,and shoulder girdle.

However, the neck region is hometo more than just neck muscles;muscles of the head, spine, and

thorax also attach in this area.

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Efferent nervescarryimpulses away from theCentral Nervous System

to muscles, controllingmovement.

The muscles of the neck areinnervated by various cranialnerves, cervical nerves, and

their branches.

Factoid:Efferent comes from the Latin exferens, which means carrying away.

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Now that you have thelay of the land, lets

take a look at a couplespecific neck muscles.

Well start with one of thelargest neck muscles (with

the longest name):the sternocleidomastoid.

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The sternocleidomastoid isoften also classified with thelateral cervical muscles.

It arises from two heads, or twodifferent points of origin, and isresponsible for movements of thecervical vertebral column and head.

Factoid: Its two points of origin are the upper

part of the anterior surface of the manubriumand the superior border, and the anterior

surface of the medial third of the clavicle.

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The sternocleidomastoidis innervated by the

Accessory Nerve (XI) andbranches from the anteriordivisions of the cervicalnerves (C02, C03).

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The scalenus muscles,or scalenes, are

sometimes classified inthe lateral vertebralregion.

It is a group of three, made upof the anterior, medius, andposterior scalenes.

Factoid:Scalene comes from the Latin wordscalenus, meaning uneven or unequal.

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The scalenes areinnervated by theanterior divisions of

the lower cervicalnerves(C03--C08).

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The scalenes and thesternocleidomastoidact together in severalmuscle actions, such aslateral neck flexion.

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The sternocleidomastoidand the anterior scalene act

together in neck flexion.

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Both the scalenes andsternocleidomastoid act incontralateral head rotation.

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Pretty amazing, huh?

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All the images and text in this eBook camefrom Visible Bodys Muscle Premium appan

encyclopedic anatomical reference for humanmusculature.

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Content in the app includes:

600+ muscles, 200+ bones, peripheral nerves, andligaments all rendered in interactive 3D, as well as dozens

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