What are the three major nerves of the arm?

The three major nerves passing through the arm are the median nerve, ulnar nerve, and radial nerve. They all originate from the brachial plexus and have distinct courses and functions.

Where does the median nerve run in the arm?

The median nerve travels in the anterior compartment of the arm. It runs lateral to the brachial artery in the upper arm, crosses in front of the artery to become medial to it, and passes deep to the bicipital aponeurosis at the cubital fossa.

Why is the ulnar nerve called the 'funny bone' nerve?

The ulnar nerve is often called the 'funny bone' because it passes behind the medial epicondyle at the elbow, where it is superficial and easily compressed, causing a tingling sensation when bumped.

What happens if the radial nerve is damaged?

Damage to the radial nerve, such as from a midshaft humerus fracture, can lead to wrist drop (inability to extend the wrist) and sensory loss over the dorsum of the hand.

Which nerves give off branches in the arm?

In the arm, the median nerve gives branches like vasomotor to the brachial artery and nerve to pronator teres, and the radial nerve gives multiple branches, including to triceps and cutaneous nerves. The ulnar nerve gives no branches in the arm.

How does the radial nerve course through the arm?

The radial nerve courses through both posterior and anterior compartments. It runs posterior to the brachial artery, enters the spiral groove of the humerus, pierces the lateral intermuscular septum, and in the cubital fossa divides into superficial (sensory) and deep (motor) branches.

What clinical signs indicate median nerve injury?

Median nerve injury, often at the cubital fossa, can affect forearm pronation and wrist and finger flexion, leading to functional deficits in hand movements.

Major Nerves of the Arm – Median, Ulnar & Radial Paths

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