skeletal and muscle system

The following videos are beneficial.
skeletal related:
http://www.youtube.com/watch?v=7vLAE_P_u_4&feature=related
http://www.youtube.com/watch?v=8d-RBe8JBVs&feature=related
muscle related:
http://www.youtube.com/watch?v=RsWNyqnHQ2I
http://www.youtube.com/watch?v=iqO3Q0gN5kY&feature=related
http://www.youtube.com/watch?feature=endscreen&NR=1&v=7Ox-NOJMhKo
 http://www.youtube.com/watch?v=2fy7zMVkTfU&feature=related