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Exploration of a brain cut in frontal section at the splenium of the corpus callosum

Colliculi, quadrigeminal brachia and geniculate bodies

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Image #22-3
Diagram Image
Legend Image
Exploration of a brain cut in frontal section at the splenium of the corpus callosum
Colliculi, quadrigeminal brachia and geniculate bodies
The structures of the mesencephalon and diencephalon are now more exposed by the removal of the meninges and arterial branches. Note the cut ends of numerous small arteries as they enter the thalamus and geniculate bodies. The continuity of the superior colliculus with the superior quadrigeminal brachium is visible. The relations of the inferior colliculus, inferior quadrigeminal brachium and medial geniculate body are also visible. The pineal body has been cut away.
  1. Corpus callosum
  2. Base of pineal body (cut across)
  3. Superior colliculus
  4. Brachium of inferior colliculus
  5. Cerebral peduncle (lateral margin)
  6. Trochlear nerve (IV)
  7. Fourth ventricle
  8. External sagittal stratum (cut across)
  9. Tapetum (exposed by removing ependyma of ventricle)
  10. Caudate nucleus (tail) (covered with ependymal membrane)
  11. Pulvinar
  12. Choroidal artery (anterior)
  13. Brachium of superior colliculus
  14. Medial geniculate body
  15. Lateral geniculate body
  16. Hippocampus (cut across)
  17. Hippocampal gyrus (cut across)
  18. Fusiform gyrus (cut across)