Formation of spinal nerve

1. Spinal segments Formation of spinal nerve Somatic nerve Cervical plexus C1-4 Brachial plexus C5-8 T1 Thoracic nerve Lumbar plexus L1-4 Sacral plexus L4 L5 S1-4

2. Spinal segments

4. Formation of spinal nerve Intrinsic back muscle Posterior root Posterior ramus Spinal ganglia Spinal nerve anterior root Anterior ramus Somatic motor nerve fiber Sensory nerve fiber

5. Carry sensation Formation of spinal nerve Somatic sensory nerve fiber afferent Posterior ramus Posterior rootlet Posterior root Somatic motor nerve fiber Spinal nerve Anterior rootlet Anterior root Somatic sensory nerve fiber 31 pairs Anterior ramus efferent Somatic motor nerve fiber form the somatic plexus Innervate voluntary muscle

6. Somatic nerve plexus

7. Cervical plexus C1-4 Cutaneous branchs

8. Phrenic nerve C3-C5 Muscular branch

9. Brachial plexus C5-8 T1 root trunk division cord

10. Branch of the roots Long thoracic nerve

11. Serratus anterior

13. Branch of the lateral cord Lateral root of median nerve Musculocutaneous nerve

15. Coracobrachialis Biceps brachii Brachialis Lateral cutaneous nerve of forearm

16. Branch of the medial cord Medial cutaneous nerve of arm Medial cutaneous nerve of forearm Ulnar nerve

17. Median nerve Ulnar nerve

18. Muscular branch of ulnar nerve Adductor pollicis 3、4 Lumbricales Interossei Hypothenar Flexor carpi ulnaris Flexor digitorum profundus muscle

19. Cutaneous branch of ulnar nerve

20. Muscular branch of median nerve Pronator teres Flexor carpi radialis Palmaris longus

21. Flexor digitorum profundus Flexor pollicis longus

22. Cutaneous branch of median nerve

23. Branch of the posterior cord Axillary nerve Thoracodorsal nerve Latissimus dorsi Radial nerve

24. Axillary nerve

25. Radial nerve

26. Muscular branch of radial nerve Extensor carpi radialis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Triceps brachii

27. Cutaneous branch of radial nerve

28. Thoracic nerve Lateral cutaneous branch Anterior cutaneous branch

29. Intercostobrachial nerve

30. Lumbar plexus L1-4

31. Femoral nerve (L2-L4) Muscular branch of femoral nerve All muscles in the anterior compartment of thigh Pectineus muscle Cutaneous branch of femoral nerve Anterior aspect of the thigh Saphenous nerve Medial side and of the leg and foot

32. Obturator nerve (L2-L4) Obturator canal All muscles in the medial compartment Skin on the medial side of the upper thigh

33. Cutaneous branch of Lumbar plexus Ilio-inguinal nerve Genitofemoral nerve Lateral cutaneous nerve of the thigh

34. Sacral plexus L4 L5 S1-4

35. L4 L5 Dorsal division S1 Sacral plexus Ventral division S2 S3 S4 S5 Co

36. Lumbosacral trunk Superior gluteal Inferior gluteal Common fibular part Tibial part Pudendal nerve Posterior femoral cutaneous nerve

37. Superior gluteal nerve Pudendal nerve Inferior gluteal nerve Posterior cutaneous nerve of thigh

38. Sciatic nerve Tibial part of the sciatic nerve Muscles in the posterior compartment of leg Except short head of biceps femoris

39. Tibial nerve Muscles in the posterior compartment of leg Muscles of foot Sural nerve Posterolateral surface of the leg Lateral side of the foot

40. Commen fibular nerve Sural communicating nerve Lateral sural cutaneous nerve Superficial fibular nerve Deep fibular nerve

41. Superficial fibular nerve Medial branch of dorsal surface of foot Lateral branch of dorsal surface of foot Fibularis longus

42. Deep fibular nerve Tibialis anterior Extensor digitorum longus Extensor hallucis longus