Facial colliculus syndrome

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Facial colliculus syndrome refers to a constellation of neurological signs due to a lesion at the facial colliculus, involving:

abducens nerve (CN VI) nucleus
facial nerve (CN VII) fibres at the genu
medial longitudinal fasciculus

and resulting in ~~peripheral~~lower motor neuron facial palsy and conjugate gaze palsy.

The facial palsy is due to interruption of the ipsilateral facial nerve fibres at the genu as they arch behind the abducens nerve (CN VI) nucleus (thus forming the colliculus).

The conjugate gaze palsy is due to involvement of innervation not only to the ipsilateral abducens nerve to lateral rectus, but also to the interneurons projecting into the medial longitudinal fasciculus which contribute to innervation of the contralateral medial rectus (thus coordinating conjugate gaze). This is not however always the case (see case 1).

Pathology

Aetiology

Causes of facial colliculus syndrome vary by age

young
- tumour
- demyelination (e.g. MS)
- viral infection (e.g. rhombencephalitis)
older
- vascular (e.g. stroke, see case 1)

-</ul><p>and resulting in peripheral facial palsy and conjugate gaze palsy.</p><p>The facial palsy is due to interruption of the ipsilateral facial nerve fibres at the genu as they arch behind the <a href="/articles/abducens-nerve">abducens nerve (CN VI)</a> nucleus (thus forming the colliculus). </p><p>The conjugate gaze palsy is due to involvement of innervation not only to the ipsilateral abducens nerve to lateral rectus, but also to the interneurons projecting into the medial longitudinal fasciculus which contribute to innervation of the contralateral medial rectus (thus coordinating conjugate gaze). This is not however always the case (see case 1).</p><h4>Pathology</h4><h5>Aetiology</h5><p>Causes of facial colliculus syndrome vary by age</p><ul>
+</ul><p>and resulting in lower motor neuron facial palsy and conjugate gaze palsy.</p><p>The facial palsy is due to interruption of the ipsilateral facial nerve fibres at the genu as they arch behind the <a href="/articles/abducens-nerve">abducens nerve (CN VI)</a> nucleus (thus forming the colliculus). </p><p>The conjugate gaze palsy is due to involvement of innervation not only to the ipsilateral abducens nerve to lateral rectus, but also to the interneurons projecting into the medial longitudinal fasciculus which contribute to innervation of the contralateral medial rectus (thus coordinating conjugate gaze). This is not however always the case (see case 1).</p><h4>Pathology</h4><h5>Aetiology</h5><p>Causes of facial colliculus syndrome vary by age</p><ul>

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Facial colliculus syndrome

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