THE BRACHIAL PLEXUS 



53 



of the medial cord are the medial head of the median and 

 the ulnar nerve, and the posterior cord divides into the axillary 



FIG. 1 6. Dissection to show the General Relations of the Brachial Plexus. 



1. Accessory nerve. 



2. Nerve to levator scapulae. 



3. Levator scapulae. 



4. Dorsal scapular nerve. 



5. Long thoracic nerve. 



6. Scalenus medius. 



7. Suprascapular nerve. 



8. Serratus anterior. 



9. Upper subscapular nerve. 



10. Subscapularis. 



11. Pectoralis minor. 



12. Nerve to coraco-brachialis. 



13. Axillary nerve. 



14. Musculo-cutaneous nerve. 



15. Radial nerve. 



16. Median nerve. 



17. Medial cutaneous nerve of forearm. 



1 8. Medial cutaneous nerve of arm. 



19. Intercpsto-brachial nerve. 



20. Latissimus dorsi. 



21. Thoraco-dorsal nerve. 



22. Long thoracic nerve. 



23. Internal jugular vein. 



24. Superior thyreoid artery. 



25. Submaxillary gland. 



26. External jugular vein. 



27. Scalenus medius. 



28. Upper trunk of brachial plexus. 



29. Middle trunk of brachial plexus. 



30. Eighth cervical nerve. 



31. Omo-hyoid. 



32. Nerve to subclavius. 



33. Lateral anterior thoracic nerve. 



34. Medial anterior thoracic nerve. 



(O.T. circumflex) nerve and the radial (O.T. musculo-spiral). 

 In addition to the terminal branches, collateral branches are 

 in 4 a 



