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Lab 3.04B Spinomedullary Junction 1. Spinal trigeminal nucleus 2. Spinal trigeminal tract 3. Spinal lemniscus 4. Fasciculus gracilis 5. Nucleus gracilis 6. Fasciculus cuneatus 7. Nucleus cuneatus 8. Pyramidal decussation 9. Dorsal spinocerebellar tract 10. Ventral spinocerebellar tract Spinomedullary Junction Spinomedullary Junction Central Canal FG NG FC SpVT NC SpVN DSCT VSCT Pyr. Decuss. Ret. Form. SL (HAT, STT, VTTT) Caudal Medulla 11. Spinal trigeminal nucleus 12. Spinal trigeminal tract 13. Spinal lemniscus 14. Fasciculus gracilis 15. Nucleus gracilis 16. Fasciculus cuneatus 17. Nucleus cuneatus 18. Pyramidal decussation 19. Dorsal spinocerebellar tract 20. Ventral spinocerebellar tract 21. Pyramid 22. Lateral cuneate nucleus 23. Internal arcuate fibers 24. Medial lemniscus Caudal Medulla Caudal Medulla FG Central Canal NG ECN FC NC SpVT SpVN SL ML Pyramid Ret. Form. DSCT VSCT IAF / Medial Lemniscus NG NC ARM ML IAF LEG Pyramid Pyramid IAF / Medial Lemniscus FG NG FC NG NC NC SpVN ARM ML ML IAF LEG Pyramid Pyramid IAF Pyramid Caudal Medulla Caudal Medulla FG NG FC NC IAF SpVN ECN Caudal Medulla Caudal Medulla PSA / PICA ASA / VA ASA Rostral Medulla 25. Spinal trigeminal nucleus 26. Spinal trigeminal tract 27. Spinal lemniscus 28. Medial lemniscus 29. Hypoglossal nucleus 30. Dorsal motor nucleus of vagus 31. Nucleus of solitary tract 32. Solitary tract 33. Nucleus ambiguus 34. Medial longitudinal fasciculus 35. Inferior vestibular nucleus 36. Medial vestibular nucleus 37. Dorsal and ventral cochlear nuclei Rostral Medulla 4TH Ventricle Rostral Medulla 4TH Ventricle Sp SpVN VT SL ML Pyramid Rostral Medulla 4TH Ventricle Rostral Medulla 4TH Ventricle DLF NTS Sol Tract DMN X XII Rostral Medulla Rostral Medulla MVN IVN MLF ICP Sp SpVN VT NA SL IO ML Pyramid Rostral Medulla 4TH Ventricle Rostral Medulla 4TH Ventricle MVN IVN NTS Sol Tract DMN X XII Rostral Medulla - Cochlear Nuclei Rostral Medulla - Cochlear Nuclei DCN MVN IVN ICP VCN Rostral Medulla Rostral Medulla ICP ML IO Pyramid Rostral Medulla Rostral Medulla PICA PSA / PICA ASA / VA Pontomedullary Junction Pontomedullary Junction ICP M L IO Pyramid Pontomedullary Junction Pontomedullary Junction ICP M L IO CST Caudal Pons 36. Pontine nuclei 37. Corticospinal tract 38. Pontocerebellar fibers 39. Medial lemniscus 40. Spinal trigeminal nucleus 41. Spinal trigeminal tract 42. Superior vestibular nucleus 43. Lateral vestibular nucleus 44. Medial longitudinal fasciculus 45. Spinal lemniscus 46. Inferior cerebellar peduncle 47. Abducens nucleus 48. Facial motor nucleus 49. Superior olivary nucleus 50. Central tegmental tract 51. Middle cerebellar peduncle 52. Deep cerebellar nuclei 53. Fastigial nucleus 54. Globose nucleus 55. Emboliform nucleus 56. Dentate nucleus Caudal Pons 4th Vent. Caudal Pons ICP 4th Vent. ML PCF CST PN Caudal Pons Caudal Pons ICP LVN S V N MLF SpVN SpVT ML SL Caudal Pons SL Caudal Pons Genu VII MLF VI VII Nerve VI Nerve VII CTT SO SL ML Caudal Pons D E G F 4th Vent. Caudal Pons D E G F SCP 4th Vent. ICP MCP Caudal Pons Caudal Pons BA / AICA BA Mid Pons 57. Pontine nuclei 58. Corticospinal tract 59. Pontocerebellar fibers 60. Medial lemniscus 61. Medial longitudinal fasciculus 62. Spinal lemniscus 63. Superior olivary nucleus 64. Lateral lemniscus 65. Central tegmental tract 66. Middle cerebellar peduncle 67. Fibers of trigeminal nerve 68. Chief sensory nucleus of trigeminal n. 69. Motor nucleus of trigeminal nerve 70. Superior cerebellar peduncle Mid Pons 4th Vent. Mid Pons 4th Vent. SCP MCP ML PCF CST PN Mid Pons 4th Vent. Mid Pons 4th Vent. MLF CTT SO SL Mid Pons Mid Pons Mes V SCP Mes V T Ch V MV MCP V Nerve CTT SO LL SL Rostral Pons 71. Pontine nuclei 72. Corticospinal tract 73. Pontocerebellar fibers 74. Middle cerebellar peduncle 75. Medial lemniscus 76. Medial longitudinal fasciculus 77. Spinal lemniscus 78. Lateral lemniscus 79. Central tegmental tract 80. Superior cerebellar peduncle 81. Locus ceruleus Rostral Pons Rostral Pons ML PCF CST PN Rostral Pons Rostral Pons VSCT SCP LL CTT SL ML Rostral Pons Rostral Pons Mes V Sup. Med. Velum IV Nerve Mes V T DLF Locus Ceruleus MLF Rostral Pons Rostral Pons SCP ML PCF CST PN Rostral Pons Rostral Pons SCA BA / SCA BA Caudal Midbrain 82. Inferior colliculus 83. Periaqueductal gray 84. Medial longitudinal fasciculus 85. Medial lemniscus 86. Spinal lemniscus 87. Lateral lemniscus 88. Central tegmental tract 89. Trochlear nucleus 90. Superior cerebellar peduncle decussation 91. Crus cerebri 92. Cerebral aqueduct Caudal Midbrain Caudal Midbrain CA PAG IC dSCP Crus Cerebri Caudal Midbrain Caudal Midbrain IC LL SL CTT ML dSCP Caudal Midbrain PAG Caudal Midbrain CA PAG IV MLF Caudal Midbrain Caudal Midbrain IV CTT dSCP MLF Caudal Midbrain Caudal Midbrain SCA / PCA BA / SCA Rostral Midbrain 93. Superior colliculus 94. Crus cerebri 95. Periaqueductal gray 96. Medial longitudinal fasciculus 97. Medial lemniscus 98. Spinal lemniscus 99. Superior cerebellar peduncle 100. Cerebral aqueduct 101. Oculomotor nucleus 102. Edinger-Westphal nucleus 103. Red nucleus 104. Substantia nigra Rostral Midbrain Rostral Midbrain SC SL PAG ML CP SN CST Crus FP Rostral Midbrain Rostral Midbrain BIC RN CN III Rostral Midbrain Rostral Midbrain PAG E-W III MLF III Fibers Rostral Midbrain MGN Rostral Midbrain III SL BIC MGN ML RN Rostral Midbrain PCA Rostral Midbrain PCA PCA PCoA Ant Ch A Trochlear Nerve Dorsal Trochlear Nerve B.S.C. Sup. Coll. MGN B.I.C. Inf. Coll. Dorsal CN IV