Okay so when you cut open a bone, you'll see multiple layers. and the inner part looks like a sponge. It has lots of little holes an pores. Compact bone is a type of bone that had no pores or holes. It is straight up bone.
Bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes, or bone<span> cells</span>
