 Hey everybody, Dr. O here and this way we're going to cover the muscles of the forearms. These are not generally as important as some of the other muscles so I'll try to go through them a little faster but there are a lot of them. So I want to give you some general advice first. The names are usually very, very helpful. So the flexors. So flexors are going to usually be on the front of the forearm and they're going to flex the wrist whereas extensors will be on the back. But then you can get other tips. So like if you see like the first one we're going to cover is the flexor carpi radialis. Well flexor tells you it flexes, carpi meaning wrist tells you what it flexes and radialis tells you it's also on the radial or thumb side which means we know that not only does it flex the wrist but it pulls the wrist towards the thumb which is called abduction or a movement towards the thumb. So that's the first one. The flexor carpi radialis. Flexion and abduction so if you're in the anatomical position I can't show you abduction would be moving your hands towards your thumb. So flexor carpi radialis, flexion and abduction of the wrist. Flexor carpi ulnaris so flexor carpi tells you it does flex the wrist but it's on the ulnar side so it's going to be involved in adduction moving your wrists towards your pinky finger. So that's the flexor carpi radialis and ulnaris so they both work together. They're synergists when it comes to wrist flexion but they're antagonists. They're the opposite of each other when it comes to abduction and adduction. Then we have the pulmaris longest there near the middle also going to flex the wrist. Flexor digitorum superficialis so first of all flex is the digit so flexion of your fingers instead of the wrist flexor digitorum superficialis tells you it's a superficial muscle meaning a deeper one will be on one of the next images and that's going to be called profundus. So superficialis means superficial, profundus means deep. Think about like a profound thought, a mind blowing thought is very deep. That's how I remember it. All right so that's the flexor carpi radialis, flexor carpi ulnaris, pulmaris longest which I just another little hint a little tip there I think about 10% of people don't have it so some people just don't have this muscle and then the flexor digitorum superficialis. Next one here just got a couple flexor polisus longest so polisus means pollux or thumb so the flexor polisus longest is going to flex the tip of your thumb. There is a shorter one but that's going to be in the hand and I won't do a video on that at this time maybe I'll do it in the future. So flexor polisus longest flexes the tip of your thumb then we have flexor digitorum profundus remember we just said flexor digitorum superficialis flexes your fingers and is superficial. This one is a deep muscle profundus meaning deep flexor digitorum profundus flexion of the fingers. All right longest list here we have brachio radialis already covered starts in the brachio region travels down the radius flexion of the elbow so it's the only muscle that's in the forearm that's function is above it at the elbow not down towards the hand. The anconius there it also plays a role in elbow extensions you can say the anconius works with the triceps to extend the elbow then we have the extensor carpi radialis longest so it extends the wrist extensor carpi it's on the radial surface so it's involved in extension and abduction towards the thumb and then it's the long one which means there's going to be the next one which is extensor carpi radialis brevis so longest means long brevis think brevity think brief brevis means short so extensor carpi radialis brevis same function it's just the shorter muscle of the two so extension and abduction towards the thumb then we have the extensor carpi ulnaris extends the wrist and then adduction of the wrist towards the away from the thumb or towards your pinky finger extensor carpi ulnaris next we have extensor digitorum extends the digits like the name implies extensor digiti minimi extends your pinky finger so your smallest digit digiti minimi so that's the extensor digiti minimi abductor polisus longest remember polix means your thumb so the abductor polisus longest abdux the thumb takes the thumb away from the rest of your hand extensor polisus longest and extensor polisus brevis remember the longest longest will be the long one brevis means brief or short will be the shorter one both of them extend the thumb so extensor polisus longest and brevis both extend the thumb last one here we have the supinator which like the name implies is involved in supination we now have the abductor polisus longest which abdux the thumb these we've covered these we can see this image as well extensor polisus longest and extensor polisus brevis they both extend the thumb flexor digitorum profundus so it's so deep you can see it on the other side of the arm flexor digitorum profundus will flex your fingers flexor carpi ulnaris you see there on the side that will flex the wrist and move it towards the ulnar or away from the thumb so that's called adduction and then we have the last one extensor indices which extends your index or pointer finger okay so that's all the key muscles of the forum I want you to know like I said I may do a separate video in the future about the hand but I'm not going to cover that at this point I hope this helps have a wonderful day be blessed