mediastinum

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mediastinum

  1. 1. Mediastinum 1 download these slides free of cost from www.slideshare.com
  2. 2. TS: Mediastinum 2
  3. 3. CS: Mediastinum 3
  4. 4. Mediastinum: Lateral view 4
  5. 5. Divisions of Mediastinum 5
  6. 6. 6
  7. 7. • Parts of mediastnum on a chest xray 7
  8. 8. Superior Mediastinum Boundaries Ant: Manubrium sterni Post: T-1 to T-4 Sides: Mediastinal pleura Sup: Plane of thoracic inlet Inf: Imaginary line joining sternal angle and lower border T-4 8
  9. 9. Superior Mediastinum 9
  10. 10. SUP & MIDDLE MEDIASTINUMSUP & MIDDLE MEDIASTINUM 10
  11. 11. Superior Mediastinum: Contents: Muscles: • Sternohyoid • Sternothyroid • Longus colli Thymus: (in childhood & puberty) Veins: • SVC • Lt & Rt brachiocephalic veins, • Lt Sup Intercostal vein Arteries: • Arch of Aorta • Brachiocepalic artery • Lt Common carotid • Lt subclavian artery Trachea & Esophagus Nerves: • Vagus • Phrenic • Cardiac & • Lt recurrent laryngeal nerve (b/w trachea & oesophagus) Thoracic Duct Lymph nodes: • Brachiocephalic, • Tracheobronchial, 11
  12. 12. SECTION at T-4 12
  13. 13. Anterior Mediastinum-(narrowest) Boundaries Ant: Body of sternum Post: Pericardium Sides: Mediastinal pleura Sup: Imaginary plane Inf: Diaphragm Contents • Thymus (in children) • Sternopericardial lig. • Internal thoracic artery & branches • Lymphatics & Lymph nodes 13
  14. 14. Middle Mediastinum: Boundaries 14
  15. 15. Middle Mediastinum Contents: Heart enclosed in pericardium Arteries: Ascending Aorta, Pulmonary trunk with its Lt & Rt branches Veins: SVC, Termination of Azygos, Pulmonary veins Nerves: Phrenic, Deep cardiac plexus Bifurcation of Trachea with two principal bronchi Tracheobronchial lymph nodes 15
  16. 16. Posterior Mediastinum Boundaries: Ant. Pericardium, Bifurcation of trachea Post. T5 to T12 sup. Transverse thor plane Inf. diaphragm Sides: Mediastinal pleura 16
  17. 17. 17
  18. 18. Posterior Mediastinum Contents: Oesophagus Arteries • Descending Aorta with its brs Veins • Azygos • Hemizygos • Accessory hemizygos Nerves: • Vagus • Splanchnic nerves Thoracic duct lymph nodes • Posterior mediastinal 18
  19. 19. Applied Anatomy:Applied Anatomy: Mediastinitis From infections of neck Pus under prevertebral fascia reachPus under prevertebral fascia reach till T4 only, not beyond it, as PV fasciatill T4 only, not beyond it, as PV fascia is attached hereis attached here Pus b/w pretracheal and prevertebralPus b/w pretracheal and prevertebral fascia seeps through sup.fascia seeps through sup. Mediastinum to reach post.Mediastinum to reach post. MediastinumMediastinum In front of pretracheal fascia to antIn front of pretracheal fascia to ant mediastinummediastinum 19
  20. 20. 20
  21. 21.  Mediastinal syndrome- •Engorgment of veins •Dyspnea •Dysphagia •Hoarseness of voice Mediastinal widening Mediasinal shift 21
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  23. 23. THANK YOU 23

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