The teres major muscle does the following:
- Laterally rotates the upper arm.This means that the teres major muscle rotates the upper arm outward around the axis of the bone (i.e. it rotates the upper arm away from the vertical midline of the body).
The muscular anatomy image shown here is in the public domain. It may have been modified by ShapeSense.com, but was originally acquired at the following address:http://en.wikipedia.org/wiki/File:Teres_major.PNG