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Subclavius is a small muscle lying between the clavicle and first rib.

System: Muscle
Function: Depresses the clavicle, assists in movements of the shoulder girdle
Origin: Costochondral junction of the first rib
Insertion: Subclavian groove on inferior surface of middle third of the clavicle
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation: Nerve to subclavius (C5, C6)
Vertebral levels:
Search for Subclavius in Gray's.



A small triangular muscle, arises by a short and thick tendon from the first rib and its costal cartilage, anterior to the costoclavicular ligament. Its fibres travel superolaterally to insert into the clavicle on the inferior surface between the costoclavicular ligament and the conoid ligament.


Joints Affected


  • First rib
  • Costal cartilage of first rib


Middle third of inferior surface of the clavicle, along the groove for subclavius.

Nerve Supply

The nerve to subclavius arises as a direct branch of the upper trunk of the brachial plexus, supplied by fibres from C5 and C6. It descends to the muscle anterior to the third part of the subclavian artery and the brachial plexus#lower trunk of the plexus, and is connects to the phrenic nerve by a small filament.