The subclavian vein is the most anterior structure and is immediately posterior to the scalenus anterior muscle and its attachment to the first rib. This muscle is divided into 2 parts.

In the subject represented, a cervical rib, heavy scalenus minimus muscle and wide scalenus anterior muscle are all present, yet the artery is unobstructed in the resting position.

Anatomical relationships between the proximal brachial plexus and scalene musculature identified in the cadaveric part of this study: (A) classic anatomical relationship between the brachial ...

3 The procedure. 3.1 The procedure is performed with the patient under general anaesthesia, by a supraclavicular approach. The brachial plexus is explored and the root avulsion confirmed. The phrenic ...