Lymphatic System Anatomy & Physiology Flashcards

Valves within lymphatic collecting vessels serve what purpose?

Answer: Preventing backflow and ensuring unidirectional lymph transport

Bicuspid valves in collecting lymphatics ensure that lymph flows only toward the thoracic duct and right lymphatic duct, preventing retrograde flow.

Which layer of the skin contains the superficial lymphatic capillary network targeted in MLD?

Answer: Superficial dermis (papillary layer)

The initial lymphatic capillaries are densely packed in the superficial dermis, which is why MLD uses very light pressure applied to the skin surface.

What is the approximate normal filtration-reabsorption balance at the capillary level?

Answer: About 90% is reabsorbed by blood capillaries; 10% enters lymphatics

Under normal Starling forces, roughly 90% of capillary filtrate is reabsorbed into venules, and the remaining 10% (with proteins) is collected by lymphatics.

The spleen differs from lymph nodes in that it filters which fluid?

Answer: Blood

Unlike lymph nodes that filter lymph, the spleen filters blood directly, removing old red blood cells, pathogens, and debris from the bloodstream.

Anastomoses in the lymphatic system refer to what?

Answer: Connections between lymphatic vessels that allow alternative drainage routes

Lymphatic anastomoses are cross-connections between vessels that enable lymph to be rerouted around blocked or removed nodes, which is the basis of MLD detour pathways.

Which autonomic stimulus increases the intrinsic contraction rate of lymphangions?

Answer: Sympathetic stimulation

Sympathetic nerve stimulation increases the frequency and force of lymphangion contractions, especially during physical activity or stress.