Colliculus_facialis

Facial colliculus

Facial colliculus

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The facial colliculus is an elevated area located in the pontine tegmentum (dorsal pons),[citation needed] within the floor of the fourth ventricle (i.e. the rhomboid fossa). It is formed by fibres from the facial motor nucleus looping over the abducens nucleus. The facial colliculus is an essential landmark of the rhomboid fossa.[1]

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Anatomy

The facial colliculus occurs within the rhomboid fossa (i.e. the floor of the fourth ventricle) where it is placed lateral to its (midline) median sulcus.[1]

Structure

The facial colliculus is formed by brachial motor nerve fibres of the facial nerve (CN VII) looping over the (ipsilateral) abducens nucleus, forming a bump upon the surface.[1]

Clinical significance

A facial colliculus lesion would result in ipsilateral facial paralysis (i.e. Bell's palsy) and inhibited ipsilateral and unopposed contralateral eye deviation.[2]

Additional images

  • Axial section of the brainstem (pons) at the level of the facial colliculus
  • Fourth ventricle. Posterior view. Deep dissection.

References

  1. [1]
    Yoo, Hannah; Mihaila, Dana M. (2022), "Neuroanatomy, Facial Colliculus", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 32310367, retrieved 2023-01-01
  2. [2]
    Yoo, Hannah; Mihaila, Dana M. (2022), "Neuroanatomy, Facial Colliculus", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 32310367, retrieved 2022-03-26


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This article uses material from the Wikipedia article Colliculus_facialis, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.