Facial colliculus
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).The facial colliculus is an essential landmark of the rhomboid fossa.[1] 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] 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] A facial colliculus lesion would result in ipsilateral facial paralysis (i.e. Bell's palsy) and inhibited ipsilateral and unopposed contralateral eye deviation.