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The shaft of a long bone is called the ________ and the end of the long bone nearest the point of attachment is called the ________. A. Epiphysis; Diaphysis B. Diaphysis; Epiphysis C. Medulla; Cortex D. Radius; Ulna
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Answer

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Step 1:
Let's solve this anatomy terminology problem step by step:

Step 2:
: Understand the Terminology

The problem is asking about the specific anatomical terms for different parts of a long bone. We need to identify the correct terms for the shaft and the end of the bone.

Step 3:
: Define the Terms

- Diaphysis: This is the shaft or central part of a long bone - Epiphysis: This is the end of a long bone, typically the wider part near the joint

Step 4:
: Analyze the Options

Let's examine each option: A. Epiphysis; Diaphysis - This is INCORRECT because it reverses the terms B. Diaphysis; Epiphysis - This is the CORRECT arrangement C. Medulla; Cortex - These terms refer to bone interior structures, not bone regions D. Radius; Ulna - These are specific bones of the forearm, not bone regions

Step 5:
: Verify the Correct Answer

The diaphysis is the long, cylindrical shaft of the bone, while the epiphysis is the wider end of the bone near the joint.

Final Answer

Diaphysis; Epiphysis The key is remembering that the diaphysis is the shaft of the long bone, and the epiphysis is the end of the bone nearest the point of attachment.