noun[mass noun] Embryology
The middle layer of cells or tissues of an embryo, or the parts derived from this (e.g. cartilage, muscles, and bone).
- The stem cells for hematopoiesis in mammals are derived from mesoderm in the yolk sac blood islands and a region of the aorta.
- Teratomas are germ cell tumors composed of various tissue elements representing more than one embryonic layer (ectoderm, mesoderm, and endoderm).
- Structures derived from ectoderm, mesoderm, and endoderm are commonly represented.
- Example sentences
- In most polychaetes, the ectodermal and mesodermal derivatives of the growth zone become incorporated into segmental tissues in an anterior-posterior sequence.
- The cells of these paraxial mesodermal cords eventually coalesce into the somites.
- Alternative and related hypotheses include those that deal explicitly with engrailed in mesodermal units, chordate evolution, and terminal posterior addition of iterated elements in development.
Late 19th century: from meso- 'middle' + Greek derma 'skin'.
For editors and proofreaders
Line breaks: meso|derm
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