http://www.cs.sfu.ca/css/update/vol8/8.1-muscles.html
This site explains in lay terms the effect of insulin-like growth factor (IGF) on the growth of muscle cells.

http://anatomy.uams.edu/HTMLpages/anatomyhtml/
Lists of bones and muscles plus a skeletal outline for major joints from the University of Arkansas.

http://rpiwww.mdacc.tmc.edu:80/se/anatomy/arm/
Viewers can click on any of several sections through the forearm to examine the positions of the muscles.