Mesenchyme

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Mesenchyme
Latin	mesenchyma
Carnegie stage	6b
Precursor	primarily mesoderm
Dorlands/Elsevier	m_10/12526276

Mesenchyme (also known as embryonic connective tissue) is the mass of tissue that develops mainly from the mesoderm (the middle layer of the trilaminar germ disc) of an embryo. ^{[citation needed]} Viscous in consistency, mesenchyme contains collagen bundles and fibroblasts. Mesenchyme later differentiates into blood vessels, blood-related organs, and connective tissues.^{[citation needed]}

Embryonic connective tissue (mesenchyme):

• Derives from the embryonic mesoderm
• Consists of loosely-packed, unspecialized cells set in a gelatinous extracellular matrix
• Develops into other types of tissues: connective, bone, cartilage
• Develops into other types of structures and systems: blood cells, endothelial cells, smooth muscle cells, circulatory system, lymphatic system.

All organs in the body contain mesenchyme.

Ectomesenchyme

Ectomesenchyme has similar properties to mesenchyme. The major difference is that ectomesenchyme is usually considered to arise from neural crest cells,^[1] which are a critical group of cells that form in the cranial region during early human development. Thus, ectomesenchyme plays a critical role in the formation of the hard and soft tissues of the head and neck such as bones, muscles and most importantly the branchial arches.^{[citation needed]}

References

1. ↑ Weston JA, Yoshida H, Robinson V, Nishikawa S, Fraser ST, Nishikawa S (2004). "Neural crest and the origin of ectomesenchyme: neural fold heterogeneity suggests an alternative hypothesis". Dev. Dyn. 229 (1): 118–30. doi:10.1002/dvdy.10478. PMID 14699583.

External links

• Overview at University of Edinburgh

v • d • e Histology: connective tissue
Classification	proper (loose/areolar, dense, adipose brown and white, reticular) embryonic (mucous, mesenchymal) specialized (cartilage, bone, blood)
Extracellular matrix	ground substance (tissue fluid) fibers (collagen, reticular fiber, elastic fibers)
Cells	resident (fibroblast, adipocyte, chondroblast, osteoblast), wandering cell

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