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thoracic duct

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thoracic duct

  1. 1. Thoracic DucT 1 download these slides free of cost from www.slideshare.com
  2. 2.  Introduction  Formation  Course  Relations  Tributaries  Applied anatomy Learning objectives 2
  3. 3. Thoracic duct - Is the largest lymphatic trunk which drains chyle(product of fat digestion) & most lymph of body. - Extent- Upper abdomen at lower border of T12 to lower part of neck, crossing post & sup mediastinum - 45cms long & 0.5cms wide - Appears Beaded due to presence of many valves in its lumen 3
  4. 4. Drains lymph from whole of body except • Rt side of head & neck • Rt upper limb • Rt lung & thoracic wall • Rt side of heart and rt surface of liver Area of drainage 4
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  6. 6. Course of Thoracic Duct 6
  7. 7. Course:  Begins in abdomen at lower border of T12 as a continuation of cisterna chyli  Enters post mediastinum through aortic opening of diaphragm(T12)  At T5 shifts to left & runs in superior mediastinum  At C7 (root of neck) arches laterally, then downwards  Ends at angle formed by union of left int jugular vein & lt subclavian vein, (regurge of blood prevented by a pair of valves) 7
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  10. 10. Relations 10
  11. 11. Scalenus ant Termination 11
  12. 12. Termination 12
  13. 13. Azygos vein TS at T4 V level 13
  14. 14. Tributaries:  Receives lymph from both halves below diaphragm through Cisternae chyli & Lt half above diaphragm 1. From post IC lymph nodes of lower 6 spaces 2. From upper lumbar nodes(paraaortic LN) 3. From Post Mediastinal lymph nodes & post IC LNs of upper 6 IC spaces 4. From axilla through Lt Subclavian trunk 5. From nodes in Lt ½ of H & N thru Lt Jugular trunk 6. From Lt half of thorax (Lt lung & Lt side of heart) through Lt Bronchomediastinal trunk 14
  15. 15. Applied anatomy  Obstruction of Thoracic duct – Due to mature filarial parasites lymph vessels get burst chylothorax, chyloperitoneum, chyluria.  Cervical part of thoracic duct is damaged in block dissection of neck  Thoracic duct is very thin walled and colourless so more prone for injury during surgery in post mediastinum. 15

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