Pectoralis major (humans) and adduction

[Genecks]

How exactly does the pectoralis major help with adduction when resistance is put on the body?

 

If you ask me, it seems like the pectoralis major would resist the weight, thus by pushing the weight upward: This would be abduction. Or am I wrong on this?

[Revenged]

I'll give you some pics to make it clearer...

 

Pec major causes the arm to be pulled in (adduction)

 

http://www.medtrng.com/abductionadduction.gif

 

Pec major causes the arm to be moved forwards (flexion)

 

http://www.3dscience.com/img/Products/Images/clip_art/skeletal_flexion_extension_web.jpg

 

And lastly pec major also causes internal rotation

 

http://www.orthop.washington.edu/_Rainbow/Album/10357m6f855b57-6ae2-4451-b416-d2e74a1cdcf7.jpg

 

All movements of the arm tend to involve combination of muscles with a combination of movements... but pec major is not involved in abduction...

[Genecks]

So, adduction would most likely apply toward swimming, right?

[Realitycheck]

Adduction would be performed when you do sit-ups, or when you close your arms from an stretched-out position.

 

Swimming would involve raising the arms which uses primarily the deltoid muscles, and pulling the arms downward, which includes the pecs and many other muscles, but primarily the lattisimus.

[MrSandman]

Here is a site that sells really good software, If you want to understand better. I bought one, but it got a nasty scratch on it. I can still use it though.

[foodchain]

I don’t know of many physical actions the body performs that uses just one thing or perfect isolation of such in anatomy. One thing that always made me laugh were guys that would just work out pecs, or do bench presses. It makes you very prone to serious injury doing routine things in your life. If you look out on the net you might even be able to find nasty pics of such injuries…