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Cervical spinal nerve 4, also called C4, is a spinal nerve of the cervical segment. It originates from the spinal cord above the 4th cervical vertebra (C4). It contributes nerve fibers to the phrenic nerve , the motor nerve to the thoracoabdominal diaphragm .
The cervical plexus has two types of branches: cutaneous and muscular. [3] Cutaneous (4 branches): Lesser occipital nerve - innervates the skin and the scalp posterosuperior to the auricle (C2) Great auricular nerve - innervates skin near concha auricle and external acoustic meatus (C2-C3)
It shows stenosis of the left intervertebral foramen between cervical vertebra 3 and 4, indicating radiculopathy of cervical spinal nerve 4. Date: 1 June 2017: Source:
Pathological processes that can occur in these joints include degenerative changes or hypertrophic arthritis, resulting in foraminal stenosis and nerve compression. Foraminal stenosis at this joint is the most common cause of cervical nerve root pressure. They were characterized by Hubert von Luschka in 1858. [4] [5]
Ansa cervicalis. The superior root of the ansa cervicalis (formerly known as descendens hypoglossi [1]: 500 ) is by fibres of the cervical spinal nerve 1 [1]: 344 [3] (and, according to some sources, of cervical spinal nerve 2 as well [3]) that have joined and run with the hypoglossal nerve (CN XII) for some distance before [1]: 344 progressively [1]: 369 branching off the CN XII in the ...
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.
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