Question

What are the 3 functional groupings of the posterior compartment of the forearm and what is their common innervation?

Answer 1

The three functional groupings of the posterior compartment of the forearm are the deep posterior compartment, superficial posterior compartment, and deep posterior extensor compartment. These groupings consist of specific muscles and are innervated by the posterior interosseous nerve.

Step-by-step explanation:

The three functional groupings of the posterior compartment of the forearm are:

1. Deep Posterior Compartment: includes muscles such as abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis. These muscles are innervated by the posterior interosseous nerve.
2. Superficial Posterior Compartment: includes muscles such as extensor radialis longus, extensor carpi radialis brevis, extensor digitorum, and extensor carpi ulnaris. These muscles are also innervated by the posterior interosseous nerve.
3. Deep Posterior Extensor Compartment: consists of the deep posterior muscles that originate on the radius and ulna. These muscles are innervated by the posterior interosseous nerve.