A Rare Cause Of Forearm Painanterior Branch Of The Medial Antebrachial Cutaneous Nerve Injury

The human body is a complex network of nerves responsible for carrying sensory and motor signals throughout. One of these nerves, the medial antebrachial cutaneous nerve (MACN), plays a crucial role in transmitting sensory information from the forearm and inner elbow to the brain. However, injuries to this nerve can result in significant discomfort and functional impairment. In this article, we will explore the causes, symptoms, and treatment options for medial antebrachial cutaneous nerve injury. Understanding the Medial Antebrachial Cutaneous Nerve

Nerve Anatomy and Function

The medial antebrachial cutaneous nerve is a sensory nerve that arises from the medial cord of the brachial plexus, a network of nerves originating from the neck. It provides sensation to the skin on the inner part of the forearm, running down to the inner elbow region.

Sensory Distribution

This nerve supplies the skin on the anterior (front) and medial (inner) aspects of the forearm, extending to the antecubital fossa, which is the area in front of the elbow joint.

Causes of Medial Antebrachial Cutaneous Nerve Injury

Trauma and Compression

Direct trauma to the inner forearm or elbow, such as from falls or accidents, can result in nerve damage. Additionally, prolonged pressure on the nerve due to repetitive movements or prolonged leaning on the elbow may cause compression and subsequent injury.

Medical Procedures

Intravenous (IV) catheter placements, blood draws, or surgeries in the inner forearm region can accidentally injure the medial antebrachial cutaneous nerve.

Symptoms of Medial Antebrachial Cutaneous Nerve Injury

Numbness and Tingling

One of the primary symptoms of nerve injury is numbness or tingling in the affected area. Patients may experience this sensation in the inner forearm and elbow.

Sensory Loss

As the nerve’s function is impaired, patients may notice a reduction in sensitivity to touch, temperature, and pain in the forearm and inner elbow.


In some cases, nerve injury may lead to weakness in the muscles innervated by the affected nerve. However, weakness is less common with medial antebrachial cutaneous nerve injuries compared to motor nerve injuries.

To diagnose a medial antebrachial cutaneous nerve injury, a healthcare professional will conduct a thorough physical examination and review the patient’s medical history. Details of any recent trauma, medical procedures, or repetitive activities will be essential in determining the cause.