Scalenus anterior muscle
Updates to Article Attributes
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was changed:
The scalenus anterior (a.k.a. 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)
-
action:
- raises first rib (inspiration)
- adjunct - neck rotation/flexion
- nerve supply: ventral rami of cervical nerves (C4, C5 and C6) from the cervical plexus and occasionally C3
- 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
-<p>The <strong>scalenus anterior</strong> (a.k.a. anterior scalene) 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>- +<p>The <strong>scalenus anterior</strong> (also known as<strong> anterior scalene</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>
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