Having a bad back describes a variety of medical conditions, including torn discs pressing on nerve tissue, or a compressed spine.

It raises the prospect that brain organoids might present new avenues for regenerating nerve tissue damaged, for example, by spinal cord injury or stroke.

Then he developed back problems that involved removing a disc and some nerve tissue.

Further occurrences of pain could indicate the presence of continuing infection or retention of vital nerve tissue.

It provides delicate handling of the prostate tissue permitting extremely accurate cutting of nerve tissue.