Multiple Choice
When examining the gross anatomy of bone, what is a key difference between compact bone and spongy bone?
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6. Bones & Skeletal Tissue
Gross Anatomy of Bone: Compact and Spongy Bone
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Which structure in compact bone is organized in concentric rings, similar to the growth rings of a tree trunk?
A
Epiphysis
B
Periosteum
C
Osteon
D
Trabecula
Verified step by step guidance1
Understand the question: The problem is asking about a structure in compact bone that is organized in concentric rings, resembling the growth rings of a tree trunk.
Recall the anatomy of compact bone: Compact bone is made up of structural units called osteons (also known as Haversian systems). These osteons are cylindrical structures that contain concentric layers of calcified matrix.
Clarify the term 'osteon': An osteon consists of concentric lamellae (rings of bone matrix) surrounding a central canal (Haversian canal), which contains blood vessels and nerves. This organization provides strength and facilitates nutrient and waste exchange.
Differentiate the other options: The epiphysis is the rounded end of a long bone, the periosteum is a fibrous membrane covering the outer surface of bones, and trabeculae are the lattice-like structures found in spongy bone. None of these are organized in concentric rings like osteons.
Conclude: Based on the description and comparison, the correct structure in compact bone organized in concentric rings is the osteon.
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