Posterior compartment of forearm

Posterior Compartment of Forearm

The posterior compartment of the forearm is one of the two compartments in the forearm, along with the anterior compartment. It is located on the back side of the forearm and contains several important muscles, nerves, and blood vessels. In this article, we will explore the anatomy and function of the muscles in the posterior compartment of the forearm.

Muscles

The muscles in the posterior compartment of the forearm are responsible for various movements of the wrist, fingers, and thumb. These muscles can be divided into two groups: superficial and deep muscles.

Superficial Muscles

The superficial muscles in the posterior compartment of the forearm include the following:

1. Triceps brachii: This muscle is located in the upper arm but extends down to the posterior compartment of the forearm. It is responsible for extending the elbow joint.

2. Anconeus: This small muscle is located on the lateral side of the elbow joint. It assists in extending the elbow and stabilizing the joint during movements.

3. Brachioradialis: Although primarily located in the anterior compartment of the forearm, the brachioradialis muscle also has some fibers that extend into the posterior compartment. It helps in flexing the forearm at the elbow joint.

Deep Muscles

The deep muscles in the posterior compartment of the forearm include the following:

1. Supinator: This muscle is located on the lateral side of the forearm. It plays a crucial role in supination, which is the movement of the forearm that allows the palm to face upwards.

2. Extensor carpi radialis longus and extensor carpi radialis brevis: These muscles are responsible for extending and abducting the wrist joint.

3. Extensor digitorum: This muscle extends the fingers at the metacarpophalangeal and interphalangeal joints.

4. Extensor carpi ulnaris: This muscle extends and adducts the wrist joint.

Nerves and Blood Vessels

The posterior compartment of the forearm is innervated by the radial nerve, which is a major nerve of the upper limb. The radial nerve gives off branches that supply the muscles in this compartment, allowing for their proper function.

In terms of blood supply, the posterior compartment receives its blood from the radial artery, which is a branch of the brachial artery. The radial artery runs along the lateral side of the forearm and provides oxygenated blood to the muscles and other structures in this compartment.

Clinical Significance

Injuries or conditions affecting the muscles, nerves, or blood vessels in the posterior compartment of the forearm can lead to various symptoms and functional limitations. Common conditions include radial nerve entrapment, tennis elbow, and muscle strains.

It is important to seek medical attention if you experience persistent pain, weakness, or any other concerning symptoms in the posterior compartment of your forearm.

See Also

• Anterior Compartment of Forearm
• Forearm
• Muscles of the forearm