myelo-, myel-

(Greek: bone marrow; the spinal cord and medulla oblongata; the myelin sheath of nerve fibers)

myelopathy (s) (noun), myelopathies (pl)
Any disease of the spinal cord: Mr. Big's back hurt him a lot and after the examination was completed, he found out that he had myelopathy in which the tissue of the medulla spinals was damaged.
myelotoxic
myesthesic (adjective), more myesthesic, most myesthesic
Descriptive of the muscular sense of the contraction movements of muscles and joints: The myesthesic movement of Mack's leg muscles was painful but encouraging as he practiced his physiotherapy exercises.

Jason was more aware of the myesthesic movements of his muscles and joints after some weeks of medical therapies that took place because of the injuries he suffered in the car accident.

neuromyelitis
osteomyelitis
poliomyelitis