Neck Muscles 030614
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Transcript of Neck Muscles 030614
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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.
MUSCLEPREMIUM
Content in the app includes:
600+ muscles, 200+ bones, peripheral nerves, andligaments all rendered in interactive 3D, as well as dozens
of interactive muscle action animations.
Functionality that allows you to rotate, zoom in/out, pan,hide, and add structures to see the anatomy from anyangle. Customize and save views.
Dozens of quizzes to test your knowledge.
Muscle Premium is available for iOS, PC, Mac, andAndroid.
Site Licenses are available for Muscle Premium. Learn more here.
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