NCIt definition : A type of bone tissue. There are two subtypes of mature bone - compact and spongy.
Compact bone is very dense and hard on the outside. Compact bone forms the thick-walled
tube of the shaft of long bones and covers the epiphyses of long bones. Spongy bone
is lightweight and consists of trabeculae, which branch and intersect to form a sponge
like network, and red bone marrow for hematopoiesis. Short bones and the epiphyses
of long bones consist mainly of spongy bone.;