Within the medulla of a bone.

Inside the spinal cord or brain tissue.

Pertaining to structures within a hollow organ.

Relating to intramedullary nails in orthopedic surgery.

Intramedullary nail: A rod inserted into the marrow cavity.

Intramedullary biopsy: Sampling tissue from within bone marrow.

Intramedullary catheter: Tube placed inside a medullar canal for access.