Scalenus anterior muscle
Updates to Article Attributes
Body
was changed:
The scalenus anterior is a neck muscle and known as the "key" structure for the thoracic inlet as it is an important anatomical landmark.
Summary
- origin - transverse processes of 3rd to 6th cervical vertebrae
- insertion - inner border of first rib (scalene tubercle)
-
action
- raises first rib (inspiration)
- adjunct - neck rotation/flexion
- nerve supply - ventral rami of cervical nerves (C4, C5 and C6) from the cervical plexus. Sometimes C3 also contributes
- note: this muscle is covered by prevertebral fascia
Gross anatomy
Relations
- anteriorly:
- phrenic nerve, vagus nerve
- ascending cervical artery, transverse cervical artery, suprascapular artery
- internal jugular vein, subclavian vein
- sternocleidomastoid muscle, omohyoid muscle
- clavicle
- posteriorly:
- second portion of subclavian artery (which is divided in three parts by the muscle)
- medially:
- common carotid artery, first portion of subclavian artery, vertebral artery and vein
- stellate ganglion
- thoracic duct (left) or right lymph duct (right).
- laterally:
- brachial plexus
- third portion of subclavian artery
-<p>The <strong>scalenus anterior</strong> is the "<em>key</em>" structure for the thoracic inlet as it is an important anatomical landmark. </p><h4>Summary</h4><ul>- +<p>The <strong>scalenus anterior</strong> is a neck muscle and known as the "<em>key</em>" structure for the thoracic inlet as it is an important anatomical landmark. </p><h4>Summary</h4><ul>
-<strong>nerve supply -</strong> ventral rami of cervical nerves (C4, C5 and C6)</li>- +<strong>nerve supply -</strong> ventral rami of cervical nerves (C4, C5 and C6) from the <a href="/articles/cervical-plexus">cervical plexus</a>. Sometimes C3 also contributes</li>
References changed:
- 3. 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>
- 1. Stone RJ, Stone JA. Atlas of skeletal muscles. McGraw-Hill Companies. (2003) ISBN:0071199012. <a href="http://books.google.com/books?vid=ISBN0071199012">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/0071199012?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0071199012">Find it at Amazon</a><div class="ref_v2"></div>
- 2. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. <a href="http://books.google.com/books?vid=ISBN044304662X">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/044304662X">Find it at Amazon</a><span class="auto"></span>
- 1. Stone RJ, Stone JA. Atlas of skeletal muscles. McGraw-Hill Companies. (2003) ISBN:0071199012. <a href="http://books.google.com/books?vid=ISBN0071199012">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/0071199012?ie=UTF8&tag=radiopaediaor-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0071199012">Find it at Amazon</a><div class="ref_v2"></div> 2. Last's Anatomy Regional and Applied. R.M.H. McMinn9th Ed.
Images Changes:
Image 1 Diagram (Nerve to scalenes and levator scapulae) ( create )
Image 2 Diagram (Cervical plexus labelled) ( create )
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