Lymphatics lesson 2, Lymph nodes and efferent lymphatic vessels скачать в хорошем качестве

Lymphatics lesson 2, Lymph nodes and efferent lymphatic vessels

Part 2 of the introductory lesson on the lymphatic system, with a focus on the nature and purpose of lymph nodes and the nature of lymphatic circulation. Afferent lymphatic vessels transport lymphatic fluid towards lymph nodes. Lymphatic capillaries drain into progressively larger lymphatic vessels. These lymphatic vessels have valves to ensure one way flow of the lymphatic fluid (or lymph) away from the tissues and towards the lymph nodes. In this respect they have a drainage function similar to veins, although lymphatic vessels have more valves and thinner walls. As lymphatic vessels may drain bacteria from a site of tissue infection, it is sometimes possible to see 'tracking' of inflammation along the line of a lymphatic vessel. This is a classical clinical feature and may indicate spread of the infection.