Final answer:
It is true that pinched nerves can be caused by problems with the alignment of the spine, and a spinal cord injury directly damages neurons rather than muscles. Sciatica is a specific example where the sciatic nerve is inflamed or compressed, leading to pain.
Step-by-step explanation:
Pinched nerves are indeed caused by problems with the alignment of the spine or other issues that may lead to pressure on the nerves. As such, the statement 'Pinched nerves are caused by problems with the alignment of the spine' is true.
The condition that directly damages neurons, and not muscles, is the spinal cord injury. The spinal cord is part of the central nervous system and is responsible for transmitting messages between the brain and the rest of the body. Damage to the spinal cord can interfere with this communication, affecting the neurons rather than the muscles themselves.
The term sciatica refers to a painful condition resulting from inflammation or compression of the sciatic nerve or any of the spinal nerves that contribute to it. This condition is a common example of how a pinched nerve can cause pain and discomfort.