Muscle
Subclavius
Protects subclavian vessels
High-yield
Depresses the clavicle; its own nerve to subclavius arises from the upper trunk of the brachial plexus.
Overview
A small muscle beneath the clavicle that anchors and depresses the clavicle and cushions the subclavian vessels during clavicular fracture.
Reference facts
- Origin
Junction of the first rib and its costal cartilage
- Insertion
Inferior surface of the middle third of the clavicle
- Action
Anchors and depresses the clavicle; stabilises the sternoclavicular joint
- Innervation
Nerve to subclavius (C5, C6)
- Blood supply
Clavicular branch of the thoracoacromial artery