Janet, to my knowledge the latissimus dorsi and triceps muscles do not participate in shoulder (glenohumeral) flexion, i.e, raising the upper arm in front of the body.
The lats do play a role in scapular depression and retraction, which are very important movements, but neither will raise your arm.
I don't mean to be too sarcastic or give anyone a hard time. Martial arts aside, I am fascinated by the movement of the human body. I just think we should expect a much higher level of clarity and accuracy in our discussion. It can only be to everyone's benefit.
No offense taken, Michael. I'm hoping that at a Calif aikiweb meetup (Labor Day wkend? Aikido of Diablo Valley?) kinesiology, ground paths, etc will be some of the things we informally play with.