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Exploration of the brain from the medial aspect

Column of fornix, mammillothalamic tract and fasciculus retroflexus

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Image #16-2
Diagram Image
Legend Image
Exploration of the brain from the medial aspect
Column of fornix, mammillothalamic tract and fasciculus retroflexus
Dissection of the medial wall of the thalamus and hypothalamus has now exposed the entire column of the fornix, the mammillothalamic tract and the fasciculus retroflexus. Some gray matter partially covers the latter tract. The internal course of several of the posterior perforating arteries can be followed in the dissected area. Within the meninges filling the transverse fissure a choroidal branch of the posterior cerebral artery is visible.
  1. Fornix (body)
  2. Choroid plexus third ventricle (note the continuation of this plexus through the interventricular foramen)
  3. Interventricular foramen (of Monro)
  4. Mamillothalamic tract
  5. Anterior commissure (cut across)
  6. Lamina terminalis
  7. Subcallosal gyrus
  8. Tectal part of column of formix
  9. Mamillary body
  10. Optic recess
  11. Infundibular recess and tuber cinereum
  12. Optic chiasm
  13. Posterior communicating artery
  14. Stria medullaris thalami
  15. Pineal body
  16. Habenula
  17. Posterior commissure (cut across)
  18. Quadrigeminal plate
  19. Opening of cerebral aqueduct
  20. Cerebral aqueduct
  21. Fasciculus retroflexus
  22. Filaments of oculomotor nerve within tegmentum
  23. Substantia nigra
  24. Oculomotor nerve (III)
  25. Posterior recess of interpeduncular fossa
  26. Posterior cerebral artery right