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Bone Marrow

Bone marrow occupies the spaces between the spicules of cancellous bone, and the interior of the diaphyses of long bones. There are 2 types of bone marrow.

bulletred bone marrow is hematopoietic tissue - where blood cells are formed. Not much red bone marrow is needed to supply the animal with blood cells.
red bone marrow

bulletyellow bone marrow consists largely of adipose tissue. It makes up the majority of the bone marrow in an adult animal.
yellow bone marrow