Everything about Subclavius Muscle totally explained
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.
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
Image:Gray115.png|Anterior surface of sternum and costal cartilages.
Image:Gray201.png|Left clavicle. Inferior surface.
Image:Gray523.png|The axillary artery and its branches.
Image:Gray809.png|The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.
Further Information
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