Subclavius muscle

Subclavius muscle

Muscle infobox
Name = Subclavius muscle
Latin = musculus subclavius
GraySubject = 122
GrayPage = 438 |


Caption = Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Subclavius visible at upper left, above first rib.)
Origin = first rib
Insertion = subclavian groove of clavicle
Action = depression of clavicle
Blood = thoracoacromial artery, clavicular branch
Nerve = nerve to subclavius
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MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 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. [Drake, Richard, et al. "Gray's Anatomy For Students," Elsevier Inc., 2005]

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

References

External links

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* [http://www.ptcentral.com/muscles/muscletrunk.html#subclavius PTCentral]


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