Fig. 7.

The cords and nerves of the left brachial plexus. (a-d) Magnetic resonance imaging of the left brachial plexus (MRI-neurography) with anatomical correlation. (e) A plastinated specimen of the left brachial plexus, anterior view, where the left hemithorax and cervical spine are dissected. 1 – the C6 root, 2 – the C7 root, 3 – the C8 root, 4 – the Th1 root, 5 – the medial cord, 6 – the lateral cord, 7 – the musculocutaneous nerve, 8 – the median nerve, 8a – the medial root, 8b – the lateral root, 9 – the ulnar nerve, 10 – the radial nerve, 11 – the posterior cord, 12 – the C5 root, 13 – the upper trunk, 14 – the middle trunk, 15 – the lower trunk, and 16 – the clavicula.