Anatomy All are true regarding trachea EXCEPT? A Has C shaped cailages B Outer diameter is 2 cm C More than 20 hyaline cailages D Isthmus of thyroid gland lies at 2, 3 and 4th tracheal rings 💡 Explanation All are true regarding trachea EXCEPT? ✓ Correct Answer: C. More than 20 hyaline cailages