Question

what is lymph heart?

Answer 1

I don't think there is any such thing as a "lymph heart."

Answer 2

There is either lymph vessels, capillaries or lymph nodes.

Answer 3

it said here (dictionary of biology by penguin), lymph heart is the enlarged part of lymphatic vessel with muscular pulsating the wall. I don't understand what does it means

Answer 4

There certainly are lymphatic vessels with contractile walls, but if that's the term the "Dictionary of Biology" by Penguine uses for them it has, in my opinion, made up a word.

Answer 5

oh...I get it some book use different word for it. But,does human have this lymphatic vessel with contractile wall?

Answer 6

Yes, humans have them. Not all lymphatic vessles have contractile walls (in fact, most don't) but some do.

Answer 7

oh..ok,thanks. you just solved my curiosity. =)

Answer 8

Sure, not a problem.

Answer 9

Lymph hearts are pulsatile organs, present in lower vertebrates, that function to propel lymph into the venous system. Although they are absent in mammals, the initial veno-lymphatic plexus that forms during mammalian jugular lymph sac development has been described as the vestigial homologue of the nascent stage of ancestral anterior lymph hearts. Despite the widespread presence of lymph hearts among vertebrate species and their unique function, extremely little is known about lymph heart development. We show that Xenopus anterior lymph heart muscle expresses skeletal muscle markers such as myoD and 12/101, rather than cardiac markers. The onset of lymph heart myoblast induction can be visualized by engrailed-1 (en1) staining in anterior trunk somites, which is dependent on Hedgehog (Hh) signaling. In the absence of Hh signaling and upon en1 knockdown, lymph heart muscle fails to develop, despite the normal development of the lymphatic endothelium of the lymph heart, and embryos develop edema. These results suggest a mechanism for the evolutionary transition from anterior lymph hearts to jugular lymph sacs in mammals.