Multiple Choice
What substance fills the hollow cavity of most bones?
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6. Bones & Skeletal Tissue
Gross Anatomy of Bone: Bone Marrow
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The spaces between trabeculae in spongy bone are filled with:
A
hyaline cartilage
B
synovial fluid
C
compact bone
D
bone marrow
Verified step by step guidance1
Step 1: Begin by understanding the structure of spongy bone. Spongy bone, also known as cancellous bone, is characterized by a porous, lattice-like network of trabeculae (small beams or struts). These trabeculae provide structural support and reduce the weight of the bone.
Step 2: Recognize that the spaces between trabeculae are not empty. These spaces are filled with a substance that plays a critical role in the production of blood cells and storage of fat.
Step 3: Recall the function of bone marrow. Bone marrow is a soft tissue found within the cavities of bones, including the spaces in spongy bone. It exists in two forms: red bone marrow, which is involved in hematopoiesis (blood cell production), and yellow bone marrow, which stores fat.
Step 4: Eliminate the incorrect options. Hyaline cartilage is a type of cartilage found in joints and other areas, not within spongy bone. Synovial fluid is a lubricating fluid found in synovial joints, and compact bone is the dense outer layer of bone, not found within the spaces of spongy bone.
Step 5: Conclude that the correct answer is bone marrow, as it is the substance that fills the spaces between trabeculae in spongy bone.
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