Final answer:
The spaces between trabeculae in spongy bone are often filled with bone marrow. Spongy bone contains osteocytes housed in lacunae within a lattice-like network of trabeculae. These trabeculae provide strength to the bone and spaces for red marrow.
Step-by-step explanation:
The spaces between trabeculae in spongy bone are often filled with bone marrow. Spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae within a lattice-like network of trabeculae. These trabeculae give strength to the bone and also provide spaces for red marrow, where hematopoiesis occurs.