## Ulnar Nerve Entry into the Forearm ### Anatomical Course The ulnar nerve passes behind the medial epicondyle of the humerus through the cubital tunnel (also called the ulnar tunnel). After exiting the cubital tunnel, it enters the forearm by passing **between the humeral and ulnar heads of the flexor carpi ulnaris muscle**. **Key Point:** This is the critical transition point from the arm to the forearm. The nerve lies in the groove between these two muscular heads, making it vulnerable to compression at this site. ### Clinical Significance Compression at this level can occur due to: - Hypertrophy of flexor carpi ulnaris - Fibrous bands or aponeurotic thickening - Trauma or repetitive strain **High-Yield:** The "two heads of FCU" landmark is a high-yield anatomical fact tested frequently in NEET PG. Memorize: **Cubital tunnel → Between FCU heads → Forearm proper**. ### Mnemonic **"FCU Gate"** — The ulnar nerve passes through the "gate" formed by the two heads of the Flexor Carpi Ulnaris to enter the forearm. 
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