 This short video, we're going to cover the key muscles of the brachial region or the upper arm. So when you think brachium, you probably think biceps brachii first. So as you can see here, biceps tells you it has two heads, brachii tells you it's in the brachial region. So there is a long and short head of the biceps. Actions of the biceps, flexion at the elbow, but very important to remember, it's also a key supinator. So remember supination is bringing your forearms or your palms forward. So make a bowl of soup. You make a bowl of soup with your hands. You're supinating. So the biceps brachii, yes, flexor, but also very strong supinator. Then we have the brachialis, which is under the biceps brachii. It travels about halfway up the arm there. This is the strongest flexor of the elbow that we have. So the biceps brachii is kind of that beach muscle, but the muscle laying underneath it does a lot of the work. It's called the workhorse because in any position, no matter where your arm is, the brachialis is the strongest elbow flexor. Then we have the, we already covered the biceps brachii there. We have the brachioradialis, so it starts above the elbow in the brachium, then travels down the radius or the thumb side of your forearm. Also a very strong flexor of the elbows, especially in what's called a neutral position. So if you were doing a hammer curl where you leave your, your, your, your hand straight up and down while you were flexing the elbow, that would be a very important way to strengthen the brachioradialis muscle. On the back, we have the triceps brachii. So it's going to be triceps, three heads. We have a long head, short head and lateral head. And then it's, it's jaw, I don't know why they have them all here, but then the, then the, it's job is going to be extension of the elbow. So that's going to be the triceps. So we have the biceps brachioradialis and brachialis muscles are all flexors of the elbow. The triceps, triceps extends the elbow. Okay. Those are the key muscles of the upper arm or the brachior region. I hope this helps. Have a wonderful day. Be blessed.