Fig. 1

Ultrasound guided posterior approach to the infraclavicular brachial plexus. a Parasagittal section through the shoulder medial to the coracoid process showing block needle and ultrasound probe. (With permission from John Wiley and Sons; Ultrasound guided posterior approach to the infraclavicular brachial plexus. Anaesthesia 2007; 62: 539). b Ideal needle insertion point – 2 cm posterior to clavicle to avoid needle contact with the inferior surface of the clavicle