Brief Anatomy Overview
The subclavius is a short, thick triangular muscle along the inferior aspect of the clavicle.
Origin – first rib
Insertion – medial clavicle.
Function – lowers clavicle.
The origin is a flat tendon that attaches on the first rib, near the sternal cartilage. It gradually transitions to muscle fibers.
The insertion is a tendon that fits into the subclavian grrove on the medial third of the clavicle.
Details of Function
The subclavius muscle is one of the extrinsic chest muscles that depresses the shoulder girdle and pectoralis minor, costal pectoralis major, abdominal pectoralis major, and the lower sections of serratus anterior.
Subclavius has a few statistically significant anomalies:
- It may insert on the coracoid process instead of the clavicle or both.
- Subclavius posticus is an uncommon muscle that attaches to the first rib’s costal cartilage and the superior border of the scapula.
- Sternoclavicularis attaches to the manubrium and the clavicle between the pectoralis major muscle and the coracoclavicular fascia.
Paget-Schroetter syndrome is a specific form of thoracic outlet syndrome where the subclavian artery moves medially until it is restricted by pressure from the subclavius. The arm becomes chronically swollen and bluish. It is more common among athletes that weight lift or play tennis. It’s present in about 15% of Thoracic Outlet Syndrome Cases.
Support Integrative Works to
and produce great content.
You can subscribe to our community on Patreon. You will get links to free content and access to exclusive content not seen on this site. In addition, we will be posting anatomy illustrations, treatment notes, and sections from our manuals not found on this site. Thank you so much for being so supportive.
Does Your Shoulder Hurt From the Covid-19 Vaccine?
This post offers quick, lasting relief from the pain in your shoulder that came from the vaccine. You will need an ice cube and about 2 minutes.
Tony Preston has a practice in Atlanta, Georgia, where he sees clients. He has written and taught about anatomy, trigger points, and cranial therapies since the mid-90s.
*This site is undergoing significant changes. We are reformatting and expanding the posts to make them easier to read. The result will also be more accessible and will include more patterns with better self-care. In the meanwhile, there may be inconsistencies in formatting, content presentation, and readability. Until we get older posts updated, please excuse our mess.