1. Trochlear Nerve Dr Hytham Nafady

7. Trochlear nucleus .

8. * = 4 th cranial nerve nucleus

9. Superior medullary vellum

13. PcoA Cn IV C n III

16. Cn 4 Cn 5 O Cn 6 Cn 3 Cn 5 mx

18. Superior orbital fissure & annular ring of Zinn

19. Cn 3 i Cn 3 s Cn 6 Cn 4

24. Nucleus & central segment

25. Left superior oblique palsy & right internuclear ophthalmoplegia

27. Trochlear nerve schwannoma

28. Trochlear nerve schwannoma along cisternal & cavernous segments

29. Vascular loop compression of the trochlear nerve by anomalous left PCA

30. Bilateral trochlear nerve palsies following dorsal midbrain haemorrhage

31. Isolated trochlear nerve palsy with dorsal midbrain hemorrhage

32. Atrophy of the superior rectus muscle in trochlear nerve palsy

33. Superior oblique muscle atrophy