Table of Contents
What are the two muscles of the forearm?
The forearm contains many muscles, including the flexors and extensors of the digits, a flexor of the elbow (brachioradialis), and pronators and supinators that turn the hand to face down or upwards, respectively. In cross-section, the forearm can be divided into two fascial compartments.
Which muscle is a powerful extensor of the arm?
They are divided into two distinct compartments of the arm. The anterior (flexor) compartment contains the biceps brachii, coracobrachialis and brachialis muscles. The posterior (extensor) compartment contains mainly the triceps brachii muscle.
What muscles are extensor muscles?
Examples of extensor muscles include the latissimus dorsi, teres major, and triceps brachii of the upper limb and the biceps femoris, gluteus maximus, and quadriceps of the lower limb.
How many extensor muscles does the forearm have?
The superficial layer of the posterior compartment contains seven muscles that have a common origin of the supracondylar ridge and laterally epicondyle of the humerus (the common extensor tendon): Brachioradialis. Extensor carpi radialis longus. Extensor carpi radialis brevis.
What are the forearm extensors?
Muscles
| Level | Muscle | Innervation |
|---|---|---|
| superficial | extensor carpi radialis longus | radial nerve |
| superficial | extensor carpi radialis brevis | radial nerve (deep branch) |
| superficial | extensor carpi ulnaris | radial nerve (as posterior interosseous nerve) |
| superficial | anconeus | radial nerve |
What are the extensors of the forearm?
What is a powerful forearm extensor?
Triceps brachii. powerful forearm extensor; antagonist of forearm flexors ( brachialis and biceps brachii.
Is a powerful forearm extensor at the elbow joint?
Two muscles – the triceps brachii and anconeus – act as the extensors of the forearm. The triceps brachii is a long muscle that runs posterior to the humerus from the scapula to the olecranon of the ulna.
What are the wrist extensors?
The wrist extensors are a group of nine individual muscles on the back of the forearm that act on the wrist and fingers. Collectively, their primary function is wrist extension, though they also help carry out other movements of the wrist and fingers.