CHARACTERISTIC OF FACIAL MUSCLE AND EFFERENT NERVE ON PHYSIOLOGY AND ANATOMY

Objective. To study tke speciality of orhicularis eculi muscles, nerves and otis muscles, nerees and mechanism of difference of facial muscular injury in facial paralysis deeply. Mettugls. The conductive velocity of the efferent nerves of orbicularis oculi and oris muscles of the health human beinge and guinea pigs is measured with electromyogram (EMG) apparatus. Results. The conductive velocity of orbicularis oculi nerve is quicker and oria muscles are controlled by facial nerves on both sides. Measuring the threshold of Strength-Duration (S-D) curves of the motor point of orbicularis oculi and otis muscles shows the threshold, of the former is lower. Measuring the diameter of orbicularis oculi and oris nerve fibers on the guinea pigs and rabbits shows the diameter of orbicularis oculi nerve fiber is bigger. The area of secondary synapse space of orbicularla oculi motor end plate is larger than that of oris under scanning electromicrwscope. Conclusiom. Orbicularla oculi muscles,orbicularis ccuh nerves and oris muscles,otis nerves all have their own characteristic on physiology and anatomy, It elucidated the mechanism that orbicularis oculi muscle is easy to be iniuried.