Lateral view, right side (photo credit - Paula Stacey, Fall 2008)

Posterior view, left side Posterior view of origin, right side
Posterior view of insertion, right side

Human information:
infraspinatus (rotator cuff)
origin:  infraspinous fossa of scapula
insertion:  posterior aspect of greater
        tubercle of humerus, and capsule
        of shoulder joint
nerve:  suprascapular (C5, C6)
action:  lateral (external) rotation and,
        horizontal abduction of arm

This is one of the four rotator cuff muscles.  It has the same action as the teres minor muscle, so Dr. J suggests that you learn these two muscles as a group.  The above drawings of the origin and insertion might help visualize this information (red is the origin, blue the insertion).

COPYRIGHT 2008 by William C. Johnson II
ALL RIGHTS RESERVED!