The mnemonic
RLN rules except CT
What each word stands for
- RLNRecurrent laryngeal nerve supplies all intrinsic muscles
- CTCricothyroid is the exception, by the external laryngeal nerve
Why it matters clinically
Predicts voice changes after thyroid surgery or superior laryngeal injury.
Where it stops being reliable
Does not cover sensory supply.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.