What is the structure of the spongy bone?


What is the structure of the spongy bone?

Macroscopic Anatomical Features of a Long Bone:

  • The diaphysis = long, cylindrical, central portion of a long bone.
  • The epiphyses = the proximal and distal ends of the bone.
  • The metaphyses = regions in mature bone where the diaphysis joins the epiphyses.
  • Articular cartilage = hyaline cartilage covering the epiphyses where the bone forms an articulation with another bone.
  • The periosteum = the tough sheath of dense irregular connective tissue that surrounds the bone surface that is not covered by articular cartilage.
  • The medullary cavity = the space within the diaphysis that contains fatty yellow bone marrow.
  • The endosteum = a thin membrane that lines the medullary cavity.

Answer and Explanation: 1

Spongy bone tissue, unlike compact bone tissue, does not contain osteons. Instead, it consists of irregularly arranged lamellae spaced in columns called trabeculae. The spaces between trabeculae make the bone lighter and may be filled with red bone marrow. Within each trabeula are lacunae that contain osteocytes.

Spongy bone tissue makes up bones that are short, flat, or irregulary shaped. It also makes up the epiphyses of long bones and a narrow rim around the medullary cavity.

Learn more about this topic:

Long Bones in the Human Body


Chapter 6 / Lesson 11

Learn about the long bones in the body, including the long bone definition and how many long bones are in the body. Discover examples of long bones, types of long bones, and where in the human skeleton long bones are found.

Related to this Question

Explore our homework questions and answers library