This slide shows a stained section of spongy bone, which consists of slender, pink-staining slivers of bone tissue called trabeculae  that form a framework enclosing the irregular marrow cavities.  The marrow cavities are filled with a hematopoietic tissue called red marrow.  Red marrow consists of developing blood cells and platelets (purple staining) as well as adipose (fat) cells, which appear as small, clear spaces.  The trabeculae are composed of parallel lamellae that contain lacunae with osteocytes.