Ansa cervicalis

Changed by Craig Hacking, 3 Jul 2015

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The ansa cervicalis is a component of the cervical plexus which gives muscular branches to the geniohyoid muscle of the suprahyoid group and ~~the~~ all 4 of the infrahyoid muscles ~~(sternohyoid, omohyoid, thyrohyoid and sternothyroid muscles)~~.

Gross anatomy

Roots

superior root
- ~~derived~~: derived from the anterior primary rami of C1
inferior root
- ~~derived~~: derived from the anterior primary rami of C2 and C3

Course

superior root
- passes with the hypoglossal nerve between rectus capitis anterior and rectus capitis lateralis muscles.
- leaves the hypoglossal nerve lateral to the occipital artery
- runs with the common carotid artery to join the inferior root
inferior root
- pierces the prevertebral fascia at the level of C2/3
- passes around the internal jugular vein
- runs anteriorly to meet with the superior root anterior to the common carotid artery

Branches

branch to geniohyoid
branches to infrahyoid (strap) muscles
- branch to thyrohyoid
- branch to omohyoid
- branch to sternohyoid
- branch to sternothyroid

-<p>The <strong>ansa cervicalis</strong> is a component of the <a href="/articles/cervical-plexus">cervical plexus</a> which gives muscular branches to the <a href="/articles/geniohyoid-muscle">geniohyoid muscle</a> of the suprahyoid group and the <a href="/articles/infrahyoid-muscles">infrahyoid muscles</a> (sternohyoid, omohyoid, thyrohyoid and sternothyroid muscles). </p><h4>Gross anatomy</h4><h5>Roots</h5><ul>
~~-<li>superior root<ul><li>derived from the anterior primary rami of C1</li></ul>~~
~~-</li>~~
~~-<li>inferior root<ul><li>derived from the anterior primary rami of C2 and C3</li></ul>~~
~~-</li>~~
+<p>The <strong>ansa cervicalis</strong> is a component of the <a href="/articles/cervical-plexus">cervical plexus</a> which gives muscular branches to the <a href="/articles/geniohyoid-muscle">geniohyoid muscle</a> of the suprahyoid group and all 4 of the <a href="/articles/infrahyoid-muscles">infrahyoid muscles</a>. </p><h4>Gross anatomy</h4><h5>Roots</h5><ul>
+<li>superior root: derived from the anterior primary rami of C1</li>
+<li>inferior root: derived from the anterior primary rami of C2 and C3</li>
~~-<li>branch to <a href="/articles/geniohyoid">geniohyoid</a>~~
+<li>branch to <a href="/articles/geniohyoid-muscle">geniohyoid</a>
~~-<li>branch to <a href="/articles/thyrohyoid">thyrohyoid</a>~~
+<li>branches to infrahyoid (strap) muscles<ul>
+<li>branch to <a href="/articles/thyrohyoid-muscle">thyrohyoid</a>
+</ul>
+</li>

References changed:

2. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. <a href="http://books.google.com/books?vid=ISBN1451119453">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/1451119453">Find it at Amazon</a><span class="auto"></span>

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