Anatomy. Love it.
"Although the sinuvertebral nerve fibers are said to terminate in the outer anulus, it is now widely accepted that this end point is not permanent. Studies of healthy patients normally show neural penetration of the anulus at about 3 mm [36], corresponding to the three outer lamellae [37]. However, degenerative discs have shown penetration of nerve fibers as far as the inner one third in one study [38], and into the nucleus pulposus in another"
A comprehensive review of the sinuvertebral nerve with clinical applications
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