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Subclavius muscle - want to learn more about it?

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Subclavius muscle

The subclavius muscle is a short muscle of the shoulder girdle.

Anatomy

Origins & Insertions

It originates at the first rib (border between the bone and cartilage) and inserts at the lower surface of the lateral clavicle. Thereby it lies behind the pectoralis major. The brachial plexus and both the subclavian artery and vein pass under the subclavius muscle. Due to its location and relatively small size the muscle is hardly palpable.

Subclavius muscle - ventral view

Innervation

The innervation is carried by the subclavian nerve (C5-6), a branch of the brachial plexus.

Recommended video: Subclavius muscle
Origins, insertions, innervation and functions of the subclavius muscle.

Function

The main task of the subclavius muscle is the active stabilization of the clavicle in the sternoclavicular joint during movements of the shoulder and arm. Furthermore its contraction leads to a depression of the clavicle and elevation of the first rib respectively. These movements however play a rather subordinate role.

Clinical Points

The vessels and nerves running behind the subclavius muscle can sometimes get entrapped in the room between the clavicle and the first rib (costoclavicular space). This is referred to as the costoclavicular syndrome and marks one of the three types of the thoracic outlet syndrome (TOS).

Causes can be fractures and thoracic deformities amongst others. Typical symptoms are irritations of the brachial plexus and circulatory disorders of the arm.

Subclavius muscle - want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

Sign up for your free Kenhub account today and join over 852,397 successful anatomy students.

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

Show references

References:

  • M. Schünke/E. Schulte/U. Schumacher: Prometheus – LernAtlas der Anatomie – Allgemeine Anatomie und Bewegungssystem, 2.Auflage, Thieme Verlag (2007), S.294-295
  • J. E. Muscolino: The muscular system manual – The skeletal muscles of the human body, 2.Auflage, Elsevier Mosby (2005), S.266-268
  • P. Reuter: Springer Lexikon Medizin, Springer Verlag (2004), S.1183

Author:

  • Achudhan Karunaharamoorthy

Illustrators:

  • Subclavius muscle - ventral view - Yousun Koh
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