NEUROMECHANIC is a simulated physical environment for developing and testing neural control models. Rigid body dynamic equations of motion, phenomenological muscle models, and simplified neuron models are incorporated.  Additional neural models can be prototyped by the user in matlab or in a dynamic linked library. NEUROMECHANIC was specifically developed to answer questions involving neural control and stability; the software linearizes the equations of motion for a given body and posture and evaluates the Lyapunov stability of the system.  In addition to analysis of animal movement the software has been used to develop control strategies for neural-machine prostheses.