MEDIAN NERVE ANATOMY

The median nerve is a key nerve in our arm. It begins from the brachial plexus, a network of nerves near the neck, with fibers from the C5-T1 spinal nerves.

1. Origin: The median nerve starts from the lateral and medial cords of the brachial plexus.

2. Course: It travels down the arm, passing through the cubital fossa, an area in front of the elbow, and into the forearm.

3. Branches in the Arm: It gives off branches to certain muscles in the arm, like the pronator teres muscle.

4. At the Elbow: The nerve continues through the forearm, passing between the two heads of the pronator teres muscle. It then enters the carpal tunnel, a narrow passageway in the wrist.

5. Forearm and Hand: Inside the carpal tunnel, the median nerve gives off branches to the muscles in the forearm and provides sensation to the palm side of the thumb, index finger, middle finger, and half of the ring finger.

6. Motor Functions: The median nerve helps the muscles responsible for flexing the wrist and fingers, and those that oppose the thumb.

7. Sensory Functions: It provides sensation to the palm side of the thumb, index finger, middle finger, and half of the ring finger.

Damage to the median nerve can cause weakness or paralysis of the muscles it controls, as well as loss of sensation in the areas it supplies. This can lead to difficulties with gripping objects and changes in sensation in the affected fingers.