A) metacarpals &shows palmar aponeurosis "mid palmar" &"thenar" spaces separated by oblique septum. Superficial palmar arch &digital branches of median (not shown) lie between palmar aponeurosis &flexor tendons. B) distal row of carpal bones &shows flexor retinaculum &carpal tunnel (contains median nerve &flexor tendons). Ulnar nerve &artery pass anterior to flexor retinaculum Ext tendons omitted. inset shows palmar aponeurosis, palmaris longus, and flexor retinaculum