During flexion of the elbow, the radial fossa of the humerus receives the _______.

Question

BlackTom AI · Accepted Answer

During elbow flexion the radial fossa of the distal humerus accommodates the head of the radius.

1) Relevant knowledge points and concepts
- The distal humerus has three depressions: the radial fossa (anterior, lateral), the coronoid fossa (anterior, medial), and the olecranon fossa (posterior). 
- The capitulum of the humerus articulates with the head of the radius; the trochlea articulates with the ulna.
- During flexion and extension, bony processes move into these fossae to allow greater range of motion.

2) Step-by-step reasoning
- Identify the radial fossa: it is an anterior lateral depression just above the capitulum.
- Determine what anatomical structure moves into that space during flexion: when the elbow flexes, the proximal radius (its rounded head) moves proximally and fits beneath the capitulum.
- Therefore the structure received by the radial fossa during flexion must be the rounded proximal end of the radius — the head.

3) Intermediate reasoning steps (anatomical matching)
- Radial fossa (anterior lateral) aligns with capitulum → capitulum articulates with radial head.
- Coronoid fossa (anterior medial) aligns with coronoid process of ulna.
- Olecranon fossa (posterior) receives olecranon of ulna during full extension.
- Radial tuberosity is distal/anterior on the radius (biceps insertion), not at the elbow articulation.

4) Why the correct answer is correct
- The radial fossa’s purpose is to receive the head of the radius during elbow flexion so the bone can move closer to the humerus without impingement. The shape and position of the radial fossa match the rounded head of the radius and its motion path during flexion.

5) Why the other options are incorrect
- Radial notch: located on the ulna, it receives the radius (not received by the humerus).
- Coronoid process: fits into the coronoid fossa of the humerus, not the radial fossa.
- Olecranon process: fits into the olecranon fossa of the humerus during extension, not into the radial fossa.
- Radial tuberosity: a distal radial landmark for muscle attachment, not a proximal articulation that fits into the radial fossa.

6) Conclusion
This reasoning confirms the correct answer: Head of the radius.

During flexion of the elbow, the radial fossa of the humerus receives the _______.单项选择题

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