[en] The authors present a detailed study of the bremsstrahlung gamma-ray emissivity of the galactic disk. It is shown that there are large uncertainties in the production spectrum of photons in the medium energy range (10-100 MeV) due to our lack of knowledge of the interstellar electron spectrum below a few hundred MeV. In fact, gamma-ray observations can be of great help in determining this spectrum. At present, the spectral shape of the local gamma-ray emissivity above 30 MeV is available, thanks to the SAS-II and the COS-B satellites. Comparing it to the present calculations, the authors determine the local interstellar electron flux in the 50-500 MeV range; the corresponding integrated gamma-ray emissivity above 100 MeV is equal to 2.4x10^-25 photons s^-1 (H-atom)^-1, 60% higher than previously accepted values. (Auth.)