AnatomyLesson 1 of 1 in the course Bone Tissue and the Skeletal System

Bone Structure, Remodeling, and Microarchitecture

5 flashcards · 5 quiz questions · 5 match pairs · 4 fill-in sentences · English

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Summary

This lesson introduces the visible structure of bones, focusing on the long bone, the protective organization of flat bones, and the surface markings that reveal how bones connect and interact with other tissues.

A long bone has a central shaft and two expanded ends. The diaphysis is the tubular shaft between the proximal and distal ends. Its dense walls are made primarily of compact bone, which provides strength and support. The hollow space inside the shaft is the medullary cavity, which contains yellow marrow.

All flashcards

What are the diaphysis and epiphyses?
The diaphysis is the shaft of a long bone; the epiphyses are its expanded ends.
How do the epiphyseal plate and epiphyseal line differ?
The plate is hyaline cartilage in a growing bone. When growth ends, it is replaced by bone tissue and appears as the epiphyseal line.
How do the periosteum and endosteum differ?
The periosteum covers most external bone surfaces; the endosteum lines the medullary cavity.
What is diploë, and where is it found?
Diploë is spongy bone between two compact-bone layers in many flat bones, including cranial bones.
What are the three general classes of bone markings?
Articulations, projections, and holes or depressions.

Quiz questions

  1. What is the primary role of osteoblasts in bone tissue?Answer: They form new bone by producing bone matrix.
  2. From which cell lineage do osteoclasts originate?Answer: Monocytes and macrophages.
  3. How are lamellae arranged in an osteon of compact bone?Answer: In concentric rings around a central canal.
  4. How are trabeculae in spongy bone typically organized?Answer: Along lines of stress acting on the bone.
  5. What is the remodeling sequence described for Paget's disease?Answer: Excessive resorption is followed by formation of weak, brittle bone.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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