Question

what lines the holes of spongy bones?

multiple choice

periosteum

endosteum

medullary cavity

red or yellow bone marrow

epiphysis

Explanation:

Identify the anatomical structure

Using the Skeletal Anatomy and Skeletal Tissues knowledge points

• Spongy bone (trabecular bone) contains a network of tiny, lattice-like structures called trabeculae, which form open spaces or "holes."
• The internal surfaces of all bones, including the canals of compact bone and the trabeculae/holes of spongy bone, are lined by a thin vascular membrane of connective tissue.
• This internal membrane is known as the endosteum.

Evaluate the given options

• periosteum: The fibrous membrane covering the outer surface of bones, not the internal cavities.
• endosteum: The membranous lining of the internal bony cavities, including the trabeculae of spongy bone.
• medullary cavity: The central cavity of bone shafts where red/yellow bone marrow is stored, not a lining membrane itself.
• red or yellow bone marrow: The soft tissue that fills the spaces, but does not line the bony structures.
• epiphysis: The rounded end of a long bone, which contains spongy bone but is a region rather than a lining.

Answer:

• periosteum
• endosteum (Correct answer)
• medullary cavity
• red or yellow bone marrow
• epiphysis