Figure 1.

(a and b) Important neurovascular structures in vicinity of the four approaches (the arrows in violet represent the path taken by needles in each of four approaches) of ultrasound-guided infraclavicular brachial plexus block. PM-Pectoralis Major. Pm-Pectoralis Minor. C-Clavicle. TAA-Thoraco-abdominal artery. AA-Axillary Artery. AV-Axillary Vein. LC-Lateral Cord. LICB-Lateral Infra Clavicular Brachial Plexus Block approach. CML-Costoclavicular medial to lateral approach. CLM-Costoclavicular lateral to medial approach. R-Retroclavicular approach