[mez-uh-durm, mes-, mee-zuh-, -suh-] /ˈmɛz əˌdɜrm, ˈmɛs-, ˈmi zə-, -sə-/

noun, Embryology.
the middle germ layer of a metazoan embryo.
the middle germ layer of an animal embryo, giving rise to muscle, blood, bone, connective tissue, etc See also ectoderm, endoderm

1858, from French mésoderme or German Mesoderm, literally “middle skin,” coined by German physician Robert Remak (1815-1865) from meso- + Greek derma (see -derm).

mesoderm mes·o·derm (měz’ə-dûrm’, měs’-)
The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop.
mes’o·der’mic adj.
The middle of the three primary germ layers of the embryos of vertebrates and other complex animals. In vertebrates, the mesoderm gives rise to the muscles, bones, cartilage, connective tissue, blood, blood and lymph vessels, dermis, kidneys, and gonads. The mesoderm develops during gastrulation from either the ectoderm or the endoderm. The embryos of simpler animals lack a mesoderm. Compare ectoderm, endoderm.


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