if u answer this,.

ok if u extend ur arms straight out and drop them at ur sides then keeping them straight bring ur arms dirctly in front of u do this movement ten times where are the muscles that cause this movemernt located?

Try here it may help:

http://vrlab.epfl.ch/~maurel/CHARM/WP3/Anatomy.html

or here ( I am not certain what you mean by straight out)..

http://www.bodybuilding.com/fun/exercises.php?MainMuscle=Shoulders

To answer your question, the muscles that are responsible for bringing your arms directly in front of you in the described movement are primarily located in the shoulder region. Specifically, the muscles involved in this movement are the anterior deltoid, which is located on the front of the shoulder, and the pectoralis major, which is a large muscle that covers the upper part of the chest. These muscles work together to flex the shoulder joint and bring the arms forward.

If you want more detailed information or visuals on the muscles involved, you can refer to the links you provided. The first link seems to be a resource for anatomical information, specifically for the CHARM (Computer Human Actuated Research Manipulator) project. You can explore the website to find the relevant information on the muscles involved in the described movement.

The second link appears to be a resource for bodybuilding exercises and focuses on the main muscles targeted by each exercise. You can navigate through the exercises related to the shoulders to find information on the specific muscles involved in bringing the arms forward.

Both of these resources should provide you with the necessary information on the muscle groups responsible for the described movement.