Trachea atf (1).mp4

4Trachea Kenhub-Trachea from Kenhub on Vimeo.mp4

https://youtu.be/5F8XdE1d0xk?si=kogAv3PbZWbeWQK1

Trachea.

• The trachea is a flexible tube that extends from the vertebral level C6 (or the lower border of cricoid cartilage) in the lower neck to the vertebral level T4/5.
• At the level of the sternal angle (T4), it bifurcates into a right and left main bronchus (carina).
• The trachea is held open by 'C-shaped' cartilage rings (16-20) embedded in its wall.
• The open part of the 'C', facing the posterior wall of the trachea, is mainly composed of smooth muscle (trachealis) and connective tissue.
• In adults, the trachea is about 4½ inches (11.25 cm) long and 1 inch (the doctor said 5½ inches (13 cm)), (2.5 cm) in diameter (approximately the diameter of your index finger).
• The trachea slightly widens and lengthens with each inspiration, returning to its resting size with each expiration.

Relations of the Trachea.

• Posterior to the trachea,
• Anteriorly
• Left
• Right

• The carina is a cartilaginous ridge within the trachea that runs Antero posteriorly between the two primary bronchi at the site of the tracheal bifurcation (T4-T5). The mucous membrane of the carina is the most sensitive area of the trachea and larynx, responsible for triggering a cough reflex. This is why doctors performing bronchoscopy try to avoid touching the carina to prevent triggering a cough reflex.