There are four muscle tendons that connect to the shoulder that make up the rotator cuff. Together these four tendons stabilize the upper arm bone to the shoulder socket and allow the wide range of motion in the shoulder.
Update Date 7/13/2015
Updated by: C. Benjamin Ma, MD, Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.