Planarians are bilaterian flatworms that lack a fluid-filled body cavity, and the space between their organ systems is filled with parenchyma. [5][13] Planarians lack a circulatory system, and absorb oxygen through their body wall. They uptake food to their gut using a muscular pharynx, and nutrients diffuse to internal tissues.

Planarian, any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes). The name planarian is used to designate any member of the family Planariidae and related families. Most planarians live in fresh water; some species are marine, while others are terrestrial.

What is a planarian? A quick overview. Planaria or Planarians (singular: Planarian) are also called “cross-eyed worms”. They are a group of tiny flatworms belonging to the phylum of Platyhelminthes. They are free-living organisms and widely distributed in …

2004年9月21日 · Given the degree of conservation between planarian and human genes, the exploration of planarian biology should contribute to understanding human biology. Like mammals, planarians do not segregate their germ cell lineage during early embryogenesis; rather, germ cells are formed from stem cells post-embryonically.

Planarians are flatworms capable of dramatic feats of regeneration, which have been studied for over two centuries. Recent findings identify key cellular and molecular principles underlying these feats.

2023年10月19日 · Even amongst planarian flatworms, well-known for complete regeneration from tiny body fragments, some species have restricted regeneration abilities while others are almost entirely regeneration...

2002年3月1日 · Planarians are free-living members (class Turbellaria) of the phylum Platyhelminthes, which are the flatworms. These animals are among the simplest organisms that have three tissue layers,...

Planarians are known for their extraordinary capacity to regenerate adult tissues. These animals can regenerate any part of their body including their entire digestive system, brain and neural connections, muscles, and connective tissues.

2004年9月21日 · Their scholarly interpretation of the history of planarian biology in the 20 th century is compelling, as we now know that planarians are not only easy to rear and manipulate surgically, but are also accessible to molecular dissection.

A planarian is any flatworm (phylum Platyhelminthes) of the suborder (or order) Tricladida of the class Turbellaria. Primarily free-living, planarians are characterized by a soft, broad, leaf-shaped (when elongated) body with cilia and a three-branched digestive tract (as reflected in …