Category: I

Within the heart muscle.  

Within the wall of an organ. Within the walls of a hollow organ or cavity.  

Within the coats of brain and spinal cord.  

Within a membrane.  

Inside the bone marrow or spinal cord. Within the medulla oblongata of the brain. Inside the medullary area of the brain or within the bone’s marrow cavity.  

Within the breast.  

Within the hollow of a vessel.  

Within the loin.  

Within ligaments, the tough strands of fibrous tissue that bind joints together.  

Within the large vein of the neck.