The subclavius is a small triangular muscle, placed between the clavicle and the first rib. Along with the pectoralis major and pectoralis minor muscles, the subclavius muscle makes up the anterior axioappendicular muscles, also known as anterior wall of the axilla.
|Origin||first rib and cartilage|
|Insertion||subclavian groove of clavicle (inferior surface of middle one third of the clavicle)|
|Artery||thoracoacromial trunk, clavicular branch|
|Actions||depression of clavicle|
elevation of first rib
|Anatomical terms of muscle|
The fleshy fibers proceed obliquely superolaterally, to be inserted into the groove on the under surface of the clavicle.
Insertion into coracoid process instead of clavicle or into both clavicle and coracoid process. Sternoscapular fasciculus to the upper border of scapula. Sternoclavicularis from manubrium to clavicle between pectoralis major and coracoclavicular fascia. Rarely, the subclavius may be missing entirely, and can lead to thoracic outlet syndrome.
It depresses the lateral clavicle, acts to stabilize the clavicle while the shoulder moves the arm. It also raises the first rib while lowering the clavicle during breathing.
- "IV. Myology: 13". Gray's Anatomy: The Muscles Connecting the Upper Extremity to the Anterior and Lateral Thoracic Walls. 1918. Archived from the original on 2014-03-08.
- Drake, Richard, et al. Gray's Anatomy For Students, Elsevier Inc., 2005
- Sternoclavicularis is a rare muscle found in a large triangular gap between the sternocostal and clavicularheads of Pectoralis Major muscle on the right side during routine cadaveric dissection.
- Yun, Sam; Park, Sekyoung; Kim, Chang Su (May 2018). "Absence of the subclavius muscle with contralateral subclavius posticus muscle: first imaging report". Clinical Imaging. 49: 54–57. doi:10.1016/j.clinimag.2017.10.008. ISSN 0899-7071. PMID 29127878.
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