Lymph heart

…Lymphatic vessels originating from the villi of the intestinal mucosa run between the mesentery and join the thoracic duct, but because the lymph is cloudy due to the presence of chyle, which is fat droplets absorbed during digestion, they are also called chyle ducts. In mammals and birds, the flow of lymph is prevented by the contraction of the lymphatic vessels themselves and the action of valves located throughout the vessels, but in lower vertebrates such as reptiles, there are no valves and the lymphatic vessels have a special device called the lymph heart, which pumps the lymphatic system. Lymphatic system [Masao Hanaoka]. …

*Some of the terminology that mentions "lymph heart" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…腸粘膜の絨毛（じゆうもう）から始まるリンパ管は，腸間膜の間を走り胸管に合流するが，消化時吸収された脂肪滴の乳糜（にゆうび）によりリンパ液が白濁しているので，乳糜管chyle ductともいう。リンパ液の流れは，哺乳類や鳥類ではリンパ管自体の収縮と随所にある弁の働きで逆流が防がれているが，爬虫類以下の下等脊椎動物では弁がなく，リンパ心臓lymph heartという特殊な装置がリンパ管にあって，そのポンプ作用による。リンパ系【花岡 正男】。…

※「lymph heart」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報