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Thoracic Cavity (Recurrent Laryngeal Nerve (RLN supplies all intrinsic…

- - - - LOS: 4cm long hypertrophied smooth muscle
      - Extrinsic Sphincter: skeletal muscle of R crus of
        diaphragm
      - Physiologic sphincter
        
        Distal component projects into abdominal cavity
        and ↑ IAP → compression
        
        Angle of His also forms valve preventing reflux.
- - - - Sup: thoracic inlet
      - Inf: angle of Louis: T4/5 (Thoracic Plane)
      - Lat: pleura
      - Ant: manubrium
      - Post: T1-4
    - - Arteries: aortic arch and branches
        
        Veins: brachiocephalics, SVC
        
        Nerves: vagi, phrenics, L recurrent laryngeal
        
        Organs: thymus, trachea, oesophagus, thoracic duct, LNs