The objective of the study aims to use direct ultrasound guidance to develop a comprehensive examination and identification of the peripheral nerves in the lower region of the upper and lower limbs (arms and legs). In a sense, this process allows us to "visualize" the nerves. In the future, with the experience of visualizing these nerves with the ultrasound machine, we can develop techniques that may allow us to perform anesthetic blockade with greater success and fewer complications.