Home » Anatomy » Torso Muscles » Extrinsic Chest Muscles » Subclavius- Functional Anatomy

Subclavius- Functional Anatomy

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.

Depressors of the shoulder girdle

Attachment Details

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.

Anomalies, Etc.

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
stay independent
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.

Featured Post

The Integrative Model

This video is a brief overview of the Integrative Bodywork Model. It explores the difference between integrated and integrated approaches. Additionally., it walks through an example.

We want your feedback! We are in the process of creating a format for individual muscles.

Please drop us a note at
[email protected].

Tony Preston has a practice in Atlanta, Georgia, where he sees clients. He has written materials and instructed classes since the mid-90s. This includes anatomy, trigger points, cranial, and neuromuscular.

Question? Comment? Typo?
[email protected]

*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 include more patterns with better self-care. Meanwhile, there may be formatting, content presentation, and readability inconsistencies. Until we get older posts updated, please excuse our mess.