This cross section of the thigh shows major muscles but is unlabelled.

http://www.vh.org/Providers/Textbooks/AnatomicVariants/MuscleGroupings.html

You can find written descriptions of muscles at this site.

http://www.uke.uni-hamburg.de/Institute/IMDM/IDV/index.en

There is a large, alphabetized list of skeletal muscles that you click on and get a written description of each muscle.