Prefix denoting the spinal cord or bone marrow?

• A. Encephal/o
• B. Bronch/o
• C. Myel/o
• D. Eryth/o

Answer: (C)

Myel/o is the combining form that denotes the spinal cord or bone marrow. This is why it fits terms referring to those tissues, such as myelopathy (disease of the spinal cord), myelitis (inflammation of the spinal cord), or myeloma (bone marrow tumor). The other options point to different tissues: encephal/o to the brain, bronch/o to the bronchi, and eryth/o to red blood cells. So the prefix that denotes the spinal cord or bone marrow is myel/o.