Thoracic duct

Thoracic duct with Lymphatic system

1. Thoracic Duct
Dr Rajiv Ranjan

2. Lymphatic system
Lymph
Lymphocytes
Lymphatic plexuses
Lymphatic vessels
Lymph nodes
Lymphoid organs
Superficial lymphatic vessels
Deep lymphatic vessels
Lymphatic trunk

3. Lymphatic system is absent in CNS ?, cornea, cartilage, Thymus
superficial layer of skin, bones & alveoli of lungs
Begin as blind ended tube

4. Lymph formation
Lymph is 1/10
th
of residual fluid

5. Lymphocytes

6. Distribution

7. Lymphatics/Lymphatic Vessels
•Superficial lymphatic vessels
•Deep lymphatic vessels
•Lymphatic trunk

8. Lymph Node

9. Lymphoid Organs

10. Lymphoid Organs

11. Lymphoid Organs

12. MALT

14. Role
Drainage of excess fluid
Cleaning
Defence
Absorption of lipid & vitamins

15. applied
•Lymphadenitis
•Lymphangitis
•Lymphedema
•Lymphogenousspread of cancer

16. Thoracic duct
•AKA left lymphatic duct or the alimentary duct
•Transports up to 4litersof lymphatic fluid each day (100ml/hr)
•Commences @ upper border of cisterna chyli(T12)
•Traverses through aortic hiatus & ascends bet
n
descending thoracic aorta &
azygosvein
•Vertebral column, the right intercostal arteries and terminal segments of the
hemiazygosand accessory hemiazygosveins lie posteriorly
•Diaphragm and Oesophagusare anteriorly.
•@ T5 it inclines to the left
•@ the root of neck it arches forwards & to the left behind the carotid sheath
•Crossing over the Lt. pleura & Lt subclavianA it enters @ the confluence of Lt.
internal jugular & Lt. subclavian V
•Termination is guarded by a bicuspid valve

19. Cisterna chyli
Confluence of lymphatics
Lie @ L1-2, posterolateral to aorta
Continue into thoracic duct superiorly
Applied –Chylothorax(chylomicrons +ve)

21. Tributaries

22. Tributaries of thoracic duct
Bilateraldescending thoracic lymph trunks from lower
6 intercostal spaces
Posterior intercostal lymph trunk of upper six left
intercostal spaces
Bilateralascending lumbar lymph trunks
Intestinal trunk
Left bronchomediastinaltrunk
Left subclaviantrunk
Left jugular trunk

23. Right lymphatic duct

24. Right lymphatic duct
Receives
Posterior intercostal lymph trunk of upper six right intercostal spaces
Right bronchomediastinaltrunk
Rightsubclavian trunk
Rightjugular trunk
•Drains into eitherrightsubclavian veinor rightinternal jugular vein
and rarely right venous angle