Scalenus anterior muscle
Updates to Article Attributes
Body
was changed:
The scalenus anterior (also known as anterior scalene) 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)
-
actionblood supply:raises first rib (inspiration)adjunct - neck rotation/flexion
-
nerve supplyinnervation: ventral rami of cervical nerves (C4, C5 and C6) from the cervical plexus and occasionally C3 - action
- raises first rib (inspiration)
- adjunct: neck rotation/flexion
- 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 lymphatic duct (right)
.
- laterally
:- brachial plexus
- third portion of subclavian artery
-<strong>o</strong><strong>rigin:</strong> transverse processes of 3<sup>rd</sup> to 6<sup>th</sup> cervical vertebrae</li>- +<strong>o</strong><strong>rigin</strong>: transverse processes of 3<sup>rd</sup> to 6<sup>th</sup> cervical vertebrae</li>
-<strong>insertion:</strong> inner border of first rib (scalene tubercle)</li>- +<strong>insertion</strong>: inner border of first rib (scalene tubercle)</li>
-<strong>action:</strong><ul>- +<strong>blood supply</strong>: ascending cervical artery</li>
- +<li>
- +<strong>innervation</strong>: ventral rami of cervical nerves (C4, C5 and C6) from the <a href="/articles/cervical-plexus">cervical plexus</a> and occasionally C3</li>
- +<li>
- +<strong>action</strong><ul>
-<li>adjunct - neck rotation/flexion</li>- +<li>adjunct: neck rotation/flexion</li>
-<li>-<strong>nerve supply:</strong> ventral rami of cervical nerves (C4, C5 and C6) from the <a href="/articles/cervical-plexus">cervical plexus</a> and occasionally C3</li>-<li>anteriorly: <ul>- +<li>anteriorly<ul>
-<li>posteriorly:<ul><li>second portion of <a href="/articles/subclavian-artery">subclavian artery</a> (which is divided in three parts by the muscle)</li></ul>- +<li>posteriorly<ul><li>second portion of <a href="/articles/subclavian-artery">subclavian artery</a> (which is divided in three parts by the muscle)</li></ul>
-<li>medially:<ul>- +<li>medially<ul>
-<a href="/articles/thoracic-duct">thoracic duct</a> (left) or right lymphatic duct (right).</li>- +<a href="/articles/thoracic-duct">thoracic duct</a> (left) or right lymphatic duct (right)</li>
-<li>laterally:<ul>- +<li>laterally<ul>
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