X CLOSE

Exploration of the basal aspects of the medulla, pons and cerebellum

Anomalous lateral recess of rhomboid fossa

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Image #28-6
Diagram Image
Legend Image
Exploration of the basal aspects of the medulla, pons and cerebellum
Anomalous lateral recess of rhomboid fossa
The tela chorioidea of an unusual, saccular, lateral recess of the fourth ventricle has been incised and a flap turned downward. Features of the lateral recess are displayed. The veins of the inferior aspect of the pons and cerebellum are injected. The inferior cerebellar veins (15) opened separately into the right superior petrosal sinus. The more posterior of these veins is also seen in reel 25, view 6 (14), as it passes across the posterior surface of the medulla. The anterior inferior cerebellar artery (20) formed a loop which passed deep into the internal auditory meatus. The loop has been cut off and the distal continuation of the artery is visible at 16.
  1. Branch of posterior inferior cerebellar artery (PICA)
  2. Tela chorioidea
  3. Choroid plexus fourth ventricle
  4. Floccular peduncle
  5. Medial continuation of cavity of lateral recess toward rhomboid fossa
  6. Ventral cochlear nucleus
  7. Glossopharyngeal nerve (IX) covered by tela chorioidea
  8. Accessory nerve (XI) (spinal root)
  9. Rootlet of vagus nerve (X)
  10. Posterior inferior cerebellar artery
  11. Medullary branch of posterior inferior cerebellar artery
  12. Quadrangular lobule of cerebellum
  13. Flocculus
  14. Brachium pontis (middle cerebellar peduncle)
  15. Inferior cerebellar veins (the vein passing posteriorly across the roof of the lateral recess is known as the petrosal vein)
  16. Distal portion of anterior inferior cerebellar artery
  17. Vestibular root of vestibulocochlear nerve
  18. Cochlear root of vestibulocochlear nerve
  19. Trigeminal nerve (V)
  20. Proximal portion of anterior inferior cerebellar artery
  21. Facial nerve (VII)
  22. Pons
  23. Abducens nerve (VI)
  24. Olive
  25. Pyramid (medulla oblongata)