Subclavius muscle
| Subclavius muscle | |
|---|---|
| File:Subclavius muscle frontal2.png Subclavius muscle (shown in red). | |
| File:Gray411subclavius.png Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Subclavius visible at upper left, above first rib.) | |
| Details | |
| Origin | First rib and cartilage |
| Insertion | Subclavian groove of clavicle (inferior surface of middle one third of the clavicle) |
| Artery | Thoracoacromial trunk, clavicular branch |
| Nerve | Subclavian nerve |
| Actions | Depression of clavicle elevation of first rib |
| Identifiers | |
| Latin | musculus subclavius |
| TA98 | Lua error in Module:Wikidata at line 746: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of muscle [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
The subclavius is a small triangular muscle, placed between the clavicle and the first rib.[1] 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.[2]
Structure
[edit | edit source]It arises by a short, thick tendon from the first rib and its cartilage at their junction, in front of the costoclavicular ligament.[1]
The fleshy fibers proceed obliquely superolaterally, to be inserted into the groove on the under surface of the clavicle.
Innervation
[edit | edit source]The nerve to subclavius (or subclavian nerve) innervates the muscle. This arises from the junction of the fifth and sixth cervical nerves, from the superior/upper trunk of the brachial plexus.
Variation
[edit | edit source]Insertion into coracoid process instead of clavicle or into both clavicle and coracoid process. Sternoscapular fasciculus to the upper border of scapula. Sternoclavicularis[3] from manubrium to clavicle between pectoralis major and coracoclavicular fascia.[1] Rarely, the subclavius may be missing entirely.[4]
Function
[edit | edit source]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.
The subclavius protects the underlying brachial plexus and subclavian vessels from a broken clavicle—the most frequently broken long bone.
Additional images
[edit | edit source]-
Subclavius muscle (shown in red).
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Anterior surface of sternum and costal cartilages.
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Left clavicle. Inferior surface.
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The axillary artery and its branches.
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The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.
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Subclavius muscle - left view
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Subclavius muscle- right view
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Subclavius (labeled top left) — frontal view
References
[edit | edit source]Public domain This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ 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.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
[edit | edit source]
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