• Trachea is 10-15 cm long tube formed by C- shaped hyaline cartilagenous rings & fibromuscular membrane.
  • It extends from lower border of cricoid cartilage (at C6 level) to lower border of T4 or upper border of T5 vertebra (T4-T5 disc space) where it bifurcates.
  • Its external diameter is about 2 cm in males & about 1.5 cm in females.
  • It has 16-20 cartilagenous rings.
  • First tracheal ring is the broadest. 
  • Last ring at tracheal bifurcation shows carina, a triangular hoop-shaped process separating the bronchi, i.e Carina is bifurcation of trachea.
  • Trachea is lined by ciliated columnar epithelium.

  •  It is supplied by inferior thyroid artery & is drained by left brachiocephalic vein.
  • Sensory & motor supply to trachea is provided by parasympathetic system through vagus and recurrent laryngeal nerve.
  • Vasomotor supply is by sympathetic fibres through middle cervical ganglion along inferior thyroid arteries.

Exam Question

  • Level of trachea bifurcation in pediatic patient is T3.
  • Cartilage in trachea Hyaline.
  • Angle of tracheal bifurcation is increased in enlargement of Left atrium.
  • Bifurcation of trachea is at Opposite the disc between the T4-T5 vertebrae.
  • Bifurcation of trachea is at the level of lower border of T4.
  • The Sensory supply of trachea is by vagus .
Don’t Forget to Solve all the previous Year Question asked on Trachea

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