Slide 03 Figure 6.9 Major Muscles of the Posterior Forearm It flexes both the wrist and the four fingers (not the thumb) to which it inserts. It’s the anterior compartment of the forearm. That is a broad muscle, curved around the upper third of the radius and it supinates the forearm.Īnd the last one we are going to talk about in this group is the flexor digitorum superficialis. The next one we are going to talk about is the supinator. And its action is that is acts to pronate (turns the palm downward) the hand. The pronator quadratus, here and this band of muscle here (lower far left diagram), is a square shaped muscle on the distal forearm. And its action is to aid the biceps brachii in flexing the forearm and pronation of the forearm at the elbow. It has an origin on the medial epicondyle of the humerus and an insertion on the radius, so it crosses the joint. That is an anterior forearm muscle located between the flexor carpi radialis and the flexor carpi ulnaris and its also responsible for the flexion of the wrist.Īlright, the next one we’re going to talk about is pronator teres, and its this muscle here (lower far left diagram). Now let’s go onto the palmaris longus, and it’s the long thin muscle there. Its also responsible for flexion of the wrist. The flexor carpi ulanaris, here, this muscle here (lower right diagram), that is an anterior, medial forearm muscle. It is responsible for flexion at the wrist. It’s an anterior, lateral forearm muscle. But you won’t see it on this slide because it’s the anterior forearm and not the posterior.Īlright, let’s go with the flexor carpi radialis, here and this muscle right there. It has three heads and it has the extension of the arm at the elbow. Now the triceps brachii is a posterior upper arm muscle. Its also a arm flexor at the elbow and is a synergist. The brachioradialis, here and here, is the lateral muscle between upper and forearm. It’s also an arm flexor at the elbow, but it’s a synergist. The brachialis, which is not on this particular graphic, is the muscle beneath the biceps brachii. The muscle is here and it is a fusiform, parallel, anterior upper arm muscle and has two origins (bi=two, ceps=head). Let’s start with the biceps brachii, here. We are going to continue on with the memorizing of our muscles, starting with the anterior forearm. Transcript:Alright, welcome back to the second lecture of module 6, the skeletal muscle system. Slide 01 Figure 6.8 Muscles of the Anterior Forearm
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