C6 has a prominent anterior tubercle of its transverse process (the carotid tubercle) against which the carotid artery can be compressed. The C6 nerve root innervates the wrist extensors and contributes to the biceps reflex.
| Articulations |
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|---|---|
| Landmarks |
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| Ossification | As per C3 vertebra pattern. |
C5-C6 is the most common cervical disc herniation level, producing C6 radiculopathy with biceps weakness, diminished biceps reflex, lateral forearm and thumb numbness. Carotid tubercle (Chassaignac's tubercle) on the C6 transverse process is the landmark for carotid artery compression to arrest haemorrhage and for stellate ganglion blocks. The vertebral arteries enter their foramina transversaria at C6.
The lower cervical spine is a common site of flexion-distraction facet dislocation in diving and motor vehicle injuries.
The most common level of cervical disc herniation, producing C7 radiculopathy with triceps weakness and pain into the middle finger.
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