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The cervical spinal nerve 7 (C7) is a spinal nerve of the cervical segment. [1] It originates from the spinal column from above the cervical vertebra 7 (C7). It runs through the interspace between the C6 and C7 vertebrae.
In a radiculopathy, the problem occurs at or near the root of the nerve, shortly after its exit from the spinal cord. However, the pain or other symptoms often radiate to the part of the body served by that nerve. For example, a nerve root impingement in the neck can produce pain and weakness in the forearm.
This is true for all spinal nerves except for the first spinal nerve pair (C1), which emerges between the occipital bone and the atlas (the first vertebra). [3] Thus the cervical nerves are numbered by the vertebra below, except spinal nerve C8, which exists below vertebra C7 and above vertebra T1.
[2] Cervical myelopathy [6] most commonly due to mechanical compression of the spinal cord in the neck as occurs in spondylotic cervical spinal stenosis but also seen in other spinal cord disease including post-traumatic tetraplegia. This finding of weak finger adduction in cervical myelopathy is also called the "finger escape sign". [7]
Cervical spinal nerve C6 helps in wrist extension and some functioning of biceps. Cervical spinal nerve C7 controls triceps and wrist extension. Cervical spinal nerve C8 helps control the hand. [18] The cervicocranial syndrome occurs when symptoms arise due to cervical vertebrae damage (misalignment, collapse, shift or disease, such as tumor ...
A dermatome is an area of skin that is mainly supplied by afferent nerve fibres from the dorsal root of any given spinal nerve. [1] [2] There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves, 5 lumbar nerves and 5 sacral nerves.
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In the cervical spine, nerve roots exit the spine above the associated vertebra (i.e. the C6 nerve root exits above the C6 vertebra). By evaluating what nerve root of the cervical spine is injured, the affected muscle groups and dermatomes can be determined. This informs the evaluator as to what activities may be limited as a result of the injury.
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