  We analyze the spatial orientation of a homogenous sample of 440 elongated
Planetary Nebulae (PNe) in order to determine the orientation of their apparent
major axis respect to the Milky Way plane. We present some important
geometrical and statistical considerations that have been overlooked by the
previous works on the subject. The global distribution of galactic position
angles (GPA) of PNe is quantitatively not very different from a random
distribution of orientations in the Galaxy. Nevertheless we find that there is
at least one region on the sky, toward the galactic center, where a weak
correlation may exist between the orientation of the major axis of some PNe and
the Galactic equator, with an excess of axes with GPA$\sim 100^{\circ}$.
Therefore, we confirm that ``extrinsic'' phenomena (i.e., global galactic
magnetic fields, shell compression from motion relative to the Interstellar
Medium) do not determine the morphology of PNe on most of the sky, with a
possible exception towards the galactic center.
