Fascial compartments of arm

Anatomical compartments in the arm

Fascial compartments of the arm

The fascial compartments of the arm are anatomical divisions within the arm that are formed by fascia, a type of connective tissue. These compartments contain muscles, nerves, and blood vessels, and are important in both the function and clinical assessment of the arm.

Structure

The arm is divided into two main fascial compartments:

Anterior Compartment

The anterior compartment of the arm, also known as the flexor compartment, is located at the front of the arm. It is primarily responsible for flexion of the elbow joint. This compartment contains the following muscles:

• Biceps brachii
• Brachialis
• Coracobrachialis

The musculocutaneous nerve innervates the muscles in this compartment. The main blood supply is provided by the brachial artery.

Posterior Compartment

The posterior compartment of the arm, also known as the extensor compartment, is located at the back of the arm. It is primarily responsible for extension of the elbow joint. This compartment contains the following muscles:

• Triceps brachii
• Anconeus

The radial nerve innervates the muscles in this compartment. The main blood supply is provided by the deep brachial artery.

Function

The fascial compartments of the arm play a crucial role in the movement and function of the upper limb. The anterior compartment is involved in flexing the elbow, which is essential for activities such as lifting and pulling. The posterior compartment is involved in extending the elbow, which is important for pushing and throwing motions.

Clinical Significance

Understanding the fascial compartments of the arm is important in diagnosing and treating various medical conditions. For example, compartment syndrome can occur when there is increased pressure within a compartment, leading to reduced blood flow and potential muscle and nerve damage. This condition requires prompt medical attention to prevent permanent damage.

Injuries to the nerves or blood vessels within these compartments can also lead to significant functional impairment. For instance, damage to the musculocutaneous nerve can result in weakness of elbow flexion, while injury to the radial nerve can cause difficulty in extending the elbow and wrist.

Related Pages

• Fascia
• Musculocutaneous nerve
• Radial nerve
• Brachial artery
• Compartment syndrome