Daily interactions with the environment by the hands such as grasping, manipulating, writing, pull/push, carry, and playing music require specific forces and some precise movements provided by the various elements of the human hand. Skeletal muscles play a significant role in locomotion of upper as well as lower limbs. The muscle tendon unit involves nonlinear characteristics. A biomechanical model has been proposed to control the motion of a phalange, actuated through the muscle tendon unit by a virtual phalange, a part of the control by the central nervous system. The authors propose a bond graph based mathematical model to control the motion of a phalange through a virtual system using tendon actuation. Simulation results validate the proposed bond graph model.