The relationship between the right lymphatic and thoracic ducts and the venous s
ID: 3513599 • Letter: T
Question
The relationship between the right lymphatic and thoracic ducts and the venous system Right internal ugular vein Brachiocephalic veins Left internalThoracic Duct ugular vein Right Lymphatic Duct Is formed by the merging of the trunks labeled below Collects lymph from the trunks labeled below Right jugular trunk - Left jugular trunk Left subclavian trunk Thoracic duct entering Right subclavian trunk Right lymphatic duct entering right subclavian veir Right bronchomediastinal trunk left subclavian vein Left bronchomediastinal trunk Superior vena cava (cut) Rib (cut) Azygos vein Thoracic duct Thoracic lymph nodes Parietal pleura (cut) Diaphragm Intestinal trunk Inferior vena cava (cut) Right lumbar trunk Left lumbar trunk Cisterna chyli 2011 Pearson Education, Inc.Explanation / Answer
Are the ducts flowing upwards? Absolutely YES
The lymph transport, in the thoracic duct, is mainly caused by the action of breathing, aided by the duct's smooth muscle and by internal valves which prevent the lymph from flowing back down again. There are also two valves at the junction of the duct with the left subclavian vein, to prevent the flow of venous blood into the duct. In adults, the thoracic duct transports up to 4 L of lymph per day.
How is the lymph getting there?
Distribution (lymph capillaries lymph collecting vessels lymph trunks lymph ducts subclavian vein)
i. Capillaries
ii. Lymphatic collecting vessels
iii. Lymphatic trunks
iv. Lymphatic ducts
Where are the ducts and what is their relationship to the subclavian veins?
There are two lymphatic ducts
1.Right lymphatic duct-----about 1.25 cm. in length, courses along the medial border of the Scalenus anterior at the root of the neck. The right lymphatic duct forms various combinations with the right subclavian vein and right internal jugular vein. A right lymphatic duct that enters directly into the junction of the internal jugular and subclavian veins is uncommon
right duct drains lymph fluid from:
2.Thoracic duct----38–45 cm in length and has an average diameter of about 5 mm. The vessel usually starts from the level of the twelfth thoracic vertebrae (T12) and extends to the root of the neck. It drains into the systemic (blood) circulation at the angle of the left subclavian and internal jugular veins as a single trunk, at the commencement of the brachiocephalic vein. It also collects most of the lymph in the body other than from the right thorax, arm, head, and neck which are drained by the right lymphatic duct.
why only drainage in subclavian vein?
two such vessels within the human body – the left subclavian vein and the right subclavian vein. They run under the collarbone, or clavicle, where they connect to the internal jugular veins to form the innominate, or brachiocephalic, veins. The subclavian veins measure between one to two centimeters in diameter, equivalent to a pinky finger;
this shows they are large enough to carry more amount of lymph
they are close to heart therefore lymph can be transported along with blood more rapidly and effectively
they large carrier veins closest to thoracic duct which is the largest lymphatic duct in the body.