Fig. 12

Ultrasound image of the interscalene brachial plexus model (a). Ultrasound image of needle placement (b). SCM, sternocleidomastoid muscle; AS, anterior scalene muscle; MS, middle scalene muscle; CA, carotid artery; IS, interscalene plexus; 1, C5 nerve root; 2, C6 nerve root; 3, C7 nerve root