This research introduces the fabrication and characterizations of flexible neuroprosthetic devices, designed to be implanted on the surface of the spinal cord for epidural stimulation. Due to the unique properties of Glassy Carbon (GC) as a biocompatible material in bioengineering applications, chemically inert, high conductivity, electrochemically stable and patternable to various geometries, an array of Glassy Carbon (GC) microelectrodes were fabricated using photolithography procedures and analyzed via Electrochemical Impedance Spectroscopy (EIS) in-vitro and in-vivo. In-vitro studies, a 0.1M Phosphate Buffered Solution was used that mimics the biological fluids. The average impedance values for the working channels of in-vitro studies were in the range of ~ 26- 114 kilo-ohms which made it typical for in-vivo use. In-Vivo studies, GC electrodes demonstrate functionality in terms of stimulation and recording over a period of at least 8 weeks. The average impedance values for the working channels of in-vivo studies were in the range of ~ 33-86 kilo-ohms.