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"Subclavius TrPs can contribute to shortening that contributes to a vascular thoracic outlet syndrome."
http://www.myofascialtherapy.org/sym...ectoralis.html


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"When trigger points shorten a subclavius muscles, it can keep tension on the collarbone, squeezing the subclavian vein and artery against the first rib and restricting circulation in the arm and hand."
The Trigger Point Therapy Workbook 2nd ed. pg 138


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"Thoracic outlet syndrome (TOS) involves compression, injury, or irritation to the neurovascular structures at the root of the neck or upper thoracic region, bounded by the anterior and middle scalenes; between the clavicle and first rib (with possible enlargement/hypertrophy of the subclavius); or beneath the pectoralis minor muscle."
http://emedicine.medscape.com/articl...erview#showall


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"The most common causes of extrinsic compression of the subclavian vein are a narrow costoclavicular space or muscular hypertrophy of the subclavius or anterior scalene."
http://surgery.ucsf.edu/conditions--...-syndrome.aspx


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"Subclavius hypertrophy"
http://neurotalk.psychcentral.com/post117146-5.html


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"The trunks of the brachial plexus pass between the anterior and middle scalene muscles. The superior trunk lies closest to the surface and is formed by the C5 and C6 roots. The suprascapular nerve and the nerve to the subclavius arise from the superior trunk."
http://neurotalk.psychcentral.com/post34419-1.html


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"The Subclavius is a small triangular muscle, placed between the clavicle and the first rib. ...

It arises by a short, thick tendon from the first rib and its cartilage at their junction, in front of the costoclavicular ligament.

The fleshy fibers proceed obliquely superolaterally, to be inserted into the groove on the under surface of the clavicle between the costoclavicular and conoid ligaments. ...

The Subclavius depresses the shoulder, carrying it downward and forward. It draws the clavicle inferiorly as well as anteriorly."
http://en.wikipedia.org/wiki/Subclavius_muscle


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The Trigger Point & Referred Pain Guide for Subclavius
http://www.triggerpoints.net/trigger...subclavius.htm