C4 is a typical cervical vertebra at approximately the level of the upper border of the thyroid cartilage, contributing to neck mobility and providing attachment points for cervical muscles and ligaments.
C4 vertebra is the level of the hyoid bone anteriorly, the level where the carotid arteries bifurcate, and the landmark for the superior thyroid cartilage. C3-C4 disc pathology produces C4 radiculopathy with cape distribution numbness over the shoulder and upper arm.
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