Almost all tissues of the body have special lymph channels that drain excess fluid directly from the interstitial spaces. The exceptions include the superficial portions of the skin, the central nervous system, the endomysium of muscles, and the bones. But, even these tissues have minute interstitial channels called prelymphatics through which interstitial fluid can flow; this fluid eventually empties either into lymphatic vessels or, in the case of the brain, into the cerebrospinal fluid and then directly back into the blood.
Essentially all the lymph vessels from the lower part of the body eventually empty into the thoracic duct, which in turn empties into the blood venous system at the juncture of the left internal jugular vein and left sub-clavian vein, as shown in Figure 16-8.
Lymph from the left side of the head, the left arm, and parts of the chest region also enters the thoracic duct before it empties into the veins.
Lymph from the right side of the neck and head, the right arm, and parts of the right thorax enters the right lymph duct (much smaller than the thoracic duct), which empties into the blood venous system at the juncture of the right subclavian vein and internal jugular vein.
Perforated capsule method for measuring interstitial fluid Terminal Lymphatic Capillaries and Their feimMNNty. M°st pressure. of the fluid filtering from the arterial ends of blood
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.