- Is one of the five main nerves originating from the brachial plexus.
- It provides motor and sensory innervation to parts of the forearm and hand.
- It receives contributions from C5-T1 nerve roots.
- It runs lateral to the axillary artery.
- Descends in the arm between the biceps brachii and triceps brachii muscles.
- It crosses over the brachial artery, and becomes situated medially Halfway down the arm.
- It enters the hand via the carpal tunnel, where it terminates by dividing into two branches.
- Muscular innervations
- Pronator teres
- Flexor carpi radialis
- Palmaris longus
- Anterior interosseous branch supplies:
- Flexor pollicis longus
- Pronator quadratus
- Flexor digitorum profundus
- The recurrent branch innervates the thenar muscles
- The palmar digital branch innervates the lateral lumbricals muscles.
- Sensory innervations
- Palmar cutaneous branch innervates the lateral aspect of the palm.
- Palmar digital cutaneous branch Innervates the palmar surface and fingertips of the lateral three and half digits.
- Standring, Susan, and Henry Gray. 2008. Gray's anatomy: the anatomical basis of clinical practice.