A skeletal muscle fiber found in an embryo. In mammalian embryos, skeletal muscle expresses myosin heavy chain-embryonic (MyHC-emb, encoded by the MYH3 gene), which regulates skeletal muscle development. [ http://www.ncbi.nlm.nih.gov/pubmed/7196501 http://www.ncbi.nlm.nih.gov/pubmed/32094117 http://orcid.org/0000-0003-2034-601X ]