The costoclavicular space is the narrow gap between the clavicle and subclavius above and the first rib below. The subclavian vein, subclavian artery and the divisions or cords of the brachial plexus pass through it on their way to the axilla.
| Location | Between the clavicle and the first rib. |
|---|---|
| Boundaries |
|
| Contents |
Transmits the main nerves and vessels of the upper limb between the neck and axilla.
The space narrows when the shoulders are pulled back and down, which is the basis of the costoclavicular manoeuvre in testing for thoracic outlet syndrome. It is a common site of venous compression leading to effort thrombosis, and a target for the costoclavicular brachial plexus block.
Compression of the subclavian vein in the costoclavicular space, sometimes causing effort thrombosis with sudden arm swelling and blue discolouration.
A displaced or malunited clavicle fracture or large callus narrowing the space and compressing the neurovascular bundle.
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