Rhomboid fossa

The fourth ventricle (Latin fossa rhomboidea ) is the diamond-shaped floor of the fourth ventricle in the region of the brain stem. It is of the cerebellar peduncles ( cerebellar peduncles ), limited to the pons and the medulla oblongata.

In the area of ​​the fourth ventricle in the brain stem are important core areas for the regulation of the circulation and the cranial nerves, as well as ascending and descending pathways.

Structures of the fourth ventricle

The following structures can be seen in the rhomboid fossa as viewed from the top ( dorsal):

  • Center trough ( median sulcus )
  • Fazialishügel ( colliculus facialis ) formed from the inner knee of the facial nerve and the nucleus nervi abducentis
  • Mark marks (striae medullares ) belong to the auditory pathway
  • Area acustica: cochlear nuclei of the vestibulocochlear nerve
  • Hypoglossusdreieck ( trigone of hypoglossal nerve ): hypoglossal nucleus, the core area of the hypoglossal nerve
  • Vagusdreieck ( trigone of vagus nerve, Ala cinerea): sensitive core area of ​​the vagus and glossopharyngeal
  • Area postrema: part of the so-called circumventricular organs, including the " vomiting center " in the brain stem

At the rear end of the fourth ventricle rises the bar ( obex ). This structure is, together with parts of the brain stem, taken at slaughter of cattle for testing for BSE.

  • Central Nervous System
Nucleus (neuroanatomy)
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