Subclavius muscle

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Subclavius muscle
Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Subclavius visible at upper left, above first rib.)
Latin musculus subclavius
Gray's subject #122 438
Origin: first rib
Insertion: subclavian groove of clavicle
Artery: thoracoacromial artery, clavicular branch
Nerve: nerve to subclavius
Action: depression of clavicle
Dorlands/Elsevier m_22/12550995

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 wall of the axilla.[1]

Origin and insertion

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 lateralward and generally upward, to be inserted into the groove on the under surface of the clavicle between the costoclavicular and conoid ligaments.

Action

The Subclavius depresses the shoulder, carrying it downward and forward. It draws the clavicle inferiorly as well as anteriorly.

The Subclavus protects the underlying brachial plexus and subclavian vessels from a broken clavicle - the most frequently broken long bone.

Variations

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.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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  1. Drake, Richard, et al. Gray's Anatomy For Students, Elsevier Inc., 2005

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