n.
An undifferentiated cell in the mesoderm of the vertebrate embryo that is a precursor of a muscle cell.
myoblast
| Dictionary: my·o·blast |
(mī'ō-blăst')
n.
An undifferentiated cell in the mesoderm of the vertebrate embryo that is a precursor of a muscle cell.
n.
An undifferentiated cell in the mesoderm of the vertebrate embryo that is a precursor of a muscle cell.
| 5min Related Video: myoblast |
| Medical Dictionary: my·o·blast |
(mī'ə-blăst')
n.
n.
A primitive muscle cell having the potential to develop into a muscle fiber. Also called sarcoblast.
| Veterinary Dictionary: myoblast |
An embryonic cell that becomes a cell of a muscle fiber.
| Wikipedia: Myoblast |
A myoblast is a type of progenitor cell that gives rise to myocytes. Myocyte, skeletal muscle cell and muscle fiber are synonymous terms. Skeletal muscle fibers are made when myoblasts fuse together; muscle fibers therefore have multiple nuclei (each nucleus originating from a single myoblast).
The fusion of myoblasts is specific to skeletal muscle (example: biceps) and not cardiac muscle or smooth muscle.
Within the muscle fiber (myocyte), there are bundles of myofibrils which are composed of a series of sarcomeres. Sarcomeres are the basic contractile units which consist of thin and thick filaments. Thin filaments are actin filaments and thick filaments consist of an arrangement of myosin proteins. The sarcomere does not contain organelles or a nucleus.
Myoblasts that do not form muscle fibers differentiate into satellite cells. These satellite cells remain adjacent to a muscle fiber, separated only by its cell membrane and by the endomysium (the connective tissue investment that divides the muscle fascicles into individual fibers).
See also
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more |
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| Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Myoblast". Read more |
