Facial colliculus
The facial colliculus is not formed by the facial nerve nucleus, but by the fibres of the facial nerve arching backwards around the abducens nerve (CN VI) nucleus before turning forwards once more. The colliculus is an elevation on the floor of the fourth ventricle.
A lesion involving the facial colliculus is therefore likely cause a facialcolliculus syndrome by involving:
- abducens nerve (CN VI) nucleus
- facial nerve (CN VII) fibres at the genu
- medial longitudinal fasciculus
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