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Questions and Answers
What is the first step of intramembranous ossification?
What is the first step of intramembranous ossification?
- Osteoblasts secrete matrix
- Mesenchymal cells differentiate into osteoblasts (correct)
- Remodeling of spongy bone forms compact bone
- Spicules form
Which step involves osteoblasts secreting matrix?
Which step involves osteoblasts secreting matrix?
- Step 2 (correct)
- Step 1
- Step 3
- Step 4
What happens in Step 3 of intramembranous ossification?
What happens in Step 3 of intramembranous ossification?
Osteoblasts surrounded by matrix become osteocytes trapped in lacunae
What occurs during Step 4 of intramembranous ossification?
What occurs during Step 4 of intramembranous ossification?
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What is described in Step 5 of the process?
What is described in Step 5 of the process?
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Describe the final step of intramembranous ossification.
Describe the final step of intramembranous ossification.
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Study Notes
Intramembranous Ossification Steps
- Mesenchymal cells transform into osteoblasts, initiating the ossification process.
- Osteoblasts release an organic matrix that serves as the foundation for bone formation.
- As osteoblasts secrete matrix, they become enclosed in it, turning into osteocytes positioned in small cavities called lacunae.
- Formation of small, needle-like structures known as spicules occurs during the ossification.
- Spicules merge to create trabeculae, which contribute to the structure of spongy bone, covered by endosteum.
- The remodeling phase converts spongy bone into compact bone, with periosteum forming around the outer surface for protection and support.
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