A<unk>  needle is usually inserted into a<unk> , wherein a small amount of tissue remains. Alternatively, an "open<unk> " can be performed by obtaining the<unk>  tissue through a small surgical incision.
Muscle biopsy
Nerve biopsy
Nerve conduction study
Electromyography
Myelography
Bone biopsy
Cervicography
Magnetic resonance myelography