Mesoderm vs Mesenchyme
In certain animals, much of the mesoderm remains undifferentiated and forms a packing tissue known as the mesenchyme, which supports and protects the organs of the body.
What is Mesoderm?
In diploblastic animals, the body plan is relatively simple with two layers of cells. The 2 layers are the outer ectoderm and the inner endoderm. The ectoderm cells face the environment and the endoderm cells face the enteron. Enteron is a cavity with a single opening to the outside. The opening is the mouth. The triploblastic condition is the condition in which a third layer known as the mesoderm developed in the embryo. Mesoderm lies in between the ectoderm and the endoderm separating the two layers of cells. This third layer, which is the mesoderm, is important to the body. Due to the mesoderm triploblastic animals can increase in size. This helps to separate the alimentary canal greatly from the body wall. Mesoderm aids in forming a variety of organs. Those organisms may combine to form an organ system. This is the organ system level organization. Some of the examples of those systems are central nervous system, digestive system, excretory system, reproductive system etc. Mesoderm also helps to improve the muscular activity of triploblastic organisms. This is necessary for their locomotion, as ciliary or flagellar movements are not enough for locomotion. Although there are many advantages due to the evolution of the mesoderm, there are certain disadvantages, as well. It becomes a barrier to the transport of material between the ectodermal layers and the endodermal layers. In some animals, the space between the ectoderm and the endoderm is completely filled by the mesoderm. This is known as the acoelomate condition. The transport problem can be avoided by flattening of the body.
What is Mesenchyme?
Mesenchyme is also called the mesenchymal connective tissue. It is a type of undifferentiated loose connective tissue. It is derived mostly from mesoderm, though some may be derived from other germ layers. Some mesenchyme is known to be derived from the ectoderm because they are derived from the neural crest cells. More often the term mesenchyme is used only for the cells that develop from the mesoderm. The term mesenchyme refers to the morphology of embryonic cells. Mesenchymal cells have the ability to migrate easily, whereas the epithelial cells do not show much mobility. These are polygonal shaped cells with polarized apical-basal orientation. These are organized into closely adherent sheets. Mesenchyme possesses a prominent ground substance matrix containing a loose aggregate of reticular fibrils and unspecialized cells. These cells retain the ability of developing into connective tissues when required such as bone, cartilage, the lymphatic system and the circulatory system
What is the difference between Mesoderm and Mesenchyme?
• In certain animals, much of the mesoderm remains undifferentiated and forms a packing tissue known as the mesenchyme, which supports and protects the organs of the body.
Most of the time, mesenchyme is derived from the mesoderm but, in certain exceptional cases, the mesenchyme may be derived from the ectoderm (from neural crest cells). More often only the cells derived from the mesoderm are referred to as mesenchyme.