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The '''facet joints''' (or '''zygapophysial joints''', '''zygapophyseal''', '''apophyseal''', or '''Z-joints''') are a set of [[synovial joint|synovial]], [[plane joint]]s between the [[articular processes]] of two adjacent [[vertebra]]e. There are two facet joints in each [[functional spinal unit|spinal motion segment]] and each facet joint is innervated by the [[Meningeal branches of spinal nerve|recurrent meningeal nerves.]]
Innervation to the facet joints vary between segments of the spinal, but they are generally innervated by medial branch nerves that come off the dorsal rami. It is thought that these nerves are for primary sensory input, though there is some evidence that they have some motor input local musculature. Within the cervical spine, most joints are innervated by the medial branch nerve (a branch of the [[dorsal rami]]) from the same levels. In other words, the facet joint between C4 and C5 vertebral segments is innervated by the C4 and C5 medial branch nerves. However, there are two exceptions:
# The facet joint between C2 and C3 is innervated by the third occipital nerve and the C3 medial branch nerve.
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