2Trachea: Landmarks Begins at lower border of cricoid cartilage / C6 2Begins at lower border of cricoid cartilage / C6Extends to CarinaRight of the midlineSternal angleT4 on inspiration / T6 on expirationLined by ciliated columnar epithelium15 cm long / 2cm in diameter15 – 20 incomplete rings of cartilageBridged post. by trachealis muscle
4Trachea Variable shape Very pliable in children 4Variable shapeUsually round, oval, oval with flattened post. borderSquareInverted pearHorseshoeVery pliable in childrenMay deviate to the right at almost 90° in normal expiratory film.
5Trachea: Carina Lies at T5 level Normal angle: 65° T4 on expirationT6 on inspirationNormal angle: 65°20° to right of midline40° to left of midlineAngle slightly larger + symmetrical in childrenAngle increases by 10° - 15° in recumbency
7Relations: Thoracic Anterior: Brachiocephalic a. 7Anterior:Brachiocephalic a.Left common carotid a.Left brachiocephalic v.
8Relations: Thoracic Posterior: Oesophagus Left recurrent laryngeal n. 8Posterior:OesophagusLeft recurrent laryngeal n.
9Relations: Thoracic Left lateral: Right lateral: Arch of the aorta 9Left lateral:Arch of the aortaLeft common carotidLeft subclavian arteriesRight lateral:Right vagus nerveArch of the azygos veinPleura
10Blood supply Upper trachea Lower part Venous drainage 10Upper tracheaInferior thyroid arteryLower partBranches of the bronchial arteryVenous drainageInferior thyroid venous plexus
11Right Paratracheal Stripe 11Interface between trachea and right upper lobeMax normal thickness 4 mm
12Left Paratracheal Stripe 12Left upper lobe and tracheaLess common (only on 21 %- 31% of films
13Posterior Tracheal Stripe 13Interface between trachea and right lungNormal max diameter 2.5 mm
14Tracheoesophageal Stripe 14Interface between esophagus and tracheaNormal max diameter 5.5 mm
15References Lines and Stripes: Where Did They Go? 15Lines and Stripes: Where Did They Go?Jerry M. Gibbs, Chitra A. Chandrasekhar, Emma C. Furgasson,Sandra A. A. OldhamApplied Radiological AnatomyPaul Butler, Adam W. M. Mitchell, Harold EllisAnatomy for Diagnostic ImagingStephanie Ryan, Michelle McNicholas, Stephen EustaceThird Edition