객관식
Which muscle is the primary extensor of the elbow joint?
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10. Muscles
Muscle Actions
객관식
Which muscle is the primary flexor of the forearm (arm at the elbow joint) during elbow flexion?
A
Brachioradialis
B
Brachialis
C
Triceps brachii
D
Deltoid
검증된 단계별 안내1
Step 1: Understand the action of elbow flexion, which involves decreasing the angle between the forearm and the arm at the elbow joint.
Step 2: Identify the muscles involved in elbow flexion. The main muscles to consider are the biceps brachii, brachialis, and brachioradialis.
Step 3: Analyze the primary function of each muscle: the brachialis lies deep to the biceps brachii and attaches to the ulna, making it the strongest flexor of the forearm regardless of forearm position.
Step 4: Recognize that the brachioradialis assists in flexion but is more active when the forearm is in a mid-pronated position, and the triceps brachii is an extensor, not a flexor.
Step 5: Conclude that the brachialis is the primary flexor of the forearm at the elbow joint during elbow flexion due to its anatomical position and function.
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