Fig. 2. Overview of the investigated areas (  left column ), with details of the measured neural contents (  right column , black spots ) and epineurial areas (  gray fields ). Interscalene (  A and  B ), supraclavicular (  C and  D ), midinfraclavicular (  E and  F ), subcoracoid (  G and  H ). aa/av = axillary artery/vein; a/v = subclavian artery/vein; BP = brachial plexus; c = clavicle; cn = cutaneous nerves; L = lung with plural cavity; m1/m2 = anterior/middle scalene muscle; mc = musculocutaneous nerve; ml/mm = lateral/medial root of median nerve; ST/MT/IT = superior/middle/inferior trunk; omo = omohyoid muscle; PC/MC/LC = posterior/medial/lateral cord; pma/pmi = major/minor pectoral muscle; r = first rib; rn = radial nerve; S = scapula; sb = subscapular muscle; u = ulnar nerve.  Bar represents 10 mm.