<prompt> At the end of C6 which is not true:Trachea bifurcatesPharynx endsEsophagus beginsLarynx ends  <response>: Ans. A Trachea bifurcatesRef: BDC, 6ted. Vol II pg. 280-81 Trachea begins at lower border of cricoid cartilage opposite to the lower border of C6 vertebra. Trachea extends up to upper border of T5 Tracheal bifurcation carina is at T4-T5 level. Length of trachea is 10-12 cm Thyroid cartilage is over 3, 4 5 tracheal ringsAt C6 vertebral level: Landmark is Cricoid cartilage Larynx ends; Trachea begins Pharynx ends; Esophagus begins Inferior thyroid artery crosses posterior to carotid sheath. Middle cervical sympathetic ganglion behind inferior thyroid artery Inferior laryngeal nerve enters the larynx. Vertebral artery enters the transverse foramen of C6. 