What is the action of the brachioradialis muscle?
A. adduction of forearm
B. abduction of forearm
C. opposition of forearm
D. flexion of forearm
The Correct Answer and Explanation is :
The correct answer to the question regarding the action of the brachioradialis muscle is D. flexion of the forearm.
Explanation:
The brachioradialis is a muscle of the forearm, primarily responsible for the flexion of the forearm at the elbow. It is located in the lateral part of the forearm, and it plays an important role when the forearm is in a neutral position (thumbs pointing upward), which is often referred to as a “hammer curl” position. The muscle assists in elbow flexion, especially when the forearm is in a mid-pronation or neutral position. It works in conjunction with other muscles such as the biceps brachii and brachialis to facilitate this movement.
The other options listed (A. adduction, B. abduction, and C. opposition) do not describe the actions of the brachioradialis. Adduction and abduction pertain to movements in the frontal plane (side-to-side), while opposition typically refers to the thumb’s movement toward the palm. Therefore, these movements are not relevant to the brachioradialis.
This muscle’s key role in forearm flexion is particularly important in activities like lifting objects or during exercises like the hammer curl.