BPK 375 Lecture Notes - Lecture 10: Individual Psychological Assessment, Age 13, Adipose Tissue
10 Nov 2016
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Bpk 375 week 10 notes growth & development of skeletal muscle. Skeletal muscle is the contractile tissue in the body under voluntary control. Striated due to organization of actin and myosin filaments. Sarcomeres are added at length on the end of muscle. Skeletal muscle develops from pluripotent embryonic mesenchyme (mesodermal cells) which will give rise to bone. At the end of week 3, the intra-embryonic mesenchyme differentiates into three loose aggregate pairs of mesenchyme on each side of the neural tube. The paraxial mesoderm will develop into paired cuboidal bodies, or somites. These will eventually develop into the bones (sclerotome), muscles (myotome), and dermis (dermatome) of and surrounding the axial skeleton. Somites appear as bumps on the dorsal surface of the embryo. At the end of week 3, 4-12 somites are present by the end of week 5, 42-44 can be counted. However, most appear between days 20-30, giving this period the title of the somite period of development.
