The arm muscle that both flexes and supinates the forearm is the a. brachialis, b. brachioradialis, c. biceps brachii, d. triceps brachii.

Video transcript

Hi, everyone. Let's take a look at this practice problem together, which muscle of the humerus is the largest and strongest extensor of the elbow joint that appears in the shape of a horse shoe on the posterior aspect of the arm. The answer options are a biceps bray I B, brachialis, C, triceps, bray I and D the soup. So let's start by talking about the soup. Recall that this is a muscle of the forearm and it is located in the posterior compartment of the forearm and it soups the forearm. It is not an extensor muscle. So we can eliminate. Option D option A is also incorrect because the biceps bray eye are located on the anterior aspect of the arm, not the posterior side. In addition, the biceps brachy eye is a flexor. It's not an extensor. Now, option B, the brachialis recall that the brachialis is a muscle that is located deep to the biceps bray eye. And so it is also on the anterior aspect and thus, it's also considered a flexor, not an extensor. That means the correct answer is the triceps, bray eye. So this is a large muscle and it has three origins and a single insertion on the electron of the, which is in the forearm. So when it contracts, it will extend that elbow joint. So the correct answer is option. C triceps, brae. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.