Which positioning baseline extends from the outer corner of the eye to the EAM for radiography of the skull and facial bones?

The orbitomeatal line is the correct choice because it is a positioning baseline that is specifically defined as extending from the outer canthus (the outer corner) of the eye to the midpoint of the external acoustic meatus (EAM). This line is crucial for certain radiographic projections of the skull and facial bones, as it helps to ensure proper alignment and positioning of the patient's head relative to the x-ray beam.

When images are taken with this baseline, it facilitates accurate representation of the facial structures as it provides a common reference point for positioning patients correctly. The orbitomeatal line is particularly used in projections such as the occipitomental (OM) view, where the goal is to visualize structures like the orbits and zygomatic arches without distortion.

Other options refer to different anatomical reference lines that may not align as accurately with the EAM in context to the outer corner of the eye, thus making them less suitable for this specific radiographic purpose.