Brachial Plexus — Transcript

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1. 0:00The Brachial Plexus
2. 0:03The brachial plexus is a network of motor and sensory nerves that innervate all the muscles and skin in the upper limb.
3. 0:10The brachial plexus is located between the neck and the axilla.
4. 0:14This video will focus primarily on the motor nerve of the brachial plexus.
5. 0:19The brachial plexus rises from the anterior rami of spinal nerve C5-T1,
6. 0:25And merges and splits several times into trunks and divisions until they finally give rise to their terminal branches.
7. 0:32The brachial plexus is divided into roots, trunks, divisions, cords and branches.
8. 0:41Routes
9. 0:43Let's start from the beginning at the vertebrae.
10. 0:45Five roots rise from the anterior rami of vertebrae C5 to T1.
11. 0:50The five roots merge to form three trunks:.
12. 0:54The upper trunk (C5-C6).
13. 0:58The middle trunk (C7).
14. 1:00And the lower trunk (C8,T1).
15. 1:07Divisions
16. 1:08As the trunk reaches the posterior aspect of the middle third of the clavicle, It splits into the anterior and posterior divisions and forms six divisions:
17. 1:17Three anterior divisions and three posterior divisions.
18. 1:22The 6th division continues to pass inferiorly behind the clavicle, enters the axillary region,
19. 1:30And becomes three cords.
20. 1:35The three cords are named according to their location relative to the axillary artery.
21. 1:42The three posterior divisions unite to form the posterior cord.
22. 1:47The upper two anterior divisions unite to form the lateral cord.
23. 1:51And the lower anterior division continues to form the medial cord.
24. 1:59Terminal branches
25. 2:01The cord split into five terminal branches at the inferior margin of the pectoralis minor.
26. 2:11And you can use the acronyms "M-A-M-R-U" to remember them.
27. 2:16The lateral cord splits into the musculocutaneous nerve (C5,C6 and C7).
28. 2:22The posterior cord splits into the axillary nerve (C5 and C6).
29. 2:28And into the radial nerve (C5,C6,C7,C8 and T1).
30. 2:34The medial and lateral cords split into the median nerve (C5,C6,C7,C8 and T1).
31. 2:43And into the ulnar nerve (C8 and T1).
32. 2:52There are many more branches arising from different parts of the brachial plexus.
33. 2:57The dorsal scapular nerve arises from root C5.
34. 3:02The long thoracic nerve arises from roots, C5,C6 and C7.
35. 3:08The upper trunk gives two branches that arise from roots C5 and C6, the nerve to the subclavius
36. 3:16And the suprascapular nerve.
37. 3:20The divisions do not provide any branches.
38. 3:25The lateral pectoral nerves, C5,C6 and C7 arise from the lateral cord.
39. 3:31The posterior cord gives branches to the upper subscapular nerve (C5,C6),
40. 3:37The thoracodorsal nerve (C6, C7,C8),
41. 3:42And the lower subscapular nerve (C5,C6).
42. 3:47And the medial cord gives branches to the medial pectoral nerve (C8,T1).
43. 3:57In summary, the brachial plexus is a network of five spinal nerves (C5 to T1).
44. 4:04It is in charge of supplying sensory and motor innervation to the upper limb.
45. 4:09And it is divided into trunks, divisions, cords and branches.