What is the clinical anatomy of the lymphatic system relevant to lymphedema?

Updated: Mar 24, 2021
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: William D James, MD  more...
  • Print
Answer

Before embarking on the treatment of lymphedema, a thorough knowledge of the relevant anatomy is essential. Blind-ended lymphatic capillaries arise within the interstitial spaces of the dermal papillae. These unvalved, superficial dermal lymphatics drain into interconnected subdermal channels, which parallel the superficial venous system. These subsequently drain into the deeper, epifascial system of valved trunks lined with smooth muscle cells and located just above the deep fascia of the extremity.

This system is responsible for the drainage of lymph from the skin and subcutaneous tissues. Valves provide for unidirectional flow towards regional lymph nodes and eventually the venous circulation in the neck. Flow is achieved by variations of tissue pressure through skeletal muscle contractions, pulsatile blood flow, and contractions of the spiral smooth muscle fibers surrounding larger lymphatic channels. (See the images below.)

Lymphatic system, anterior view. Lymphatic system, anterior view.
The body quadrants of superficial lymph drainage. The body quadrants of superficial lymph drainage.

A deeper-valved subfascial system of lymphatics is responsible for the drainage of lymph from the fascia, muscles, joints, ligaments, periosteum, and bone. This subfascial system parallels the deep venous system of the extremity.

The epifascial and subfascial systems normally function independently, although valved connections do exist in the popliteal, inguinal, antecubital, and axillary regions where lymph nodes form interconnected chains. These connections probably do not function under normal conditions; however, in lymphedema, some reversed flow through perforators from the epifascial to the subfascial system may occur as a mechanism of decompression of the epifascial system.

However, the derangement in lymphedema is almost always exclusive to the epifascial lymphatic system, with the subfascial system being uninvolved. Thus, the surgical approaches to lymphedema focus on the epifascial system.


Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!