Question

For the lateral projection of the skull, which positioning baseline is placed parallel to the long axis of the IR?

a) OML
b) IOML
c) MML
d) AML

Answer 1

The IOML (infraorbital meatal line) is the positioning baseline placed parallel to the long axis of the IR in the lateral projection of the skull.

Step-by-step explanation:

In the lateral projection of the skull, the positioning baseline that is placed parallel to the long axis of the IR is the IOML (infraorbital meatal line).

This line is formed by drawing a line from the infraorbital margin (lower rim of the eye socket) to the external auditory meatus (opening of the ear canal). This positioning baseline ensures that the skull is positioned correctly for the lateral projection.

Other positioning baselines mentioned in the question, OML (orbitomeatal line), MML (mental meatal line), and AML (acanthiomeatal line), are used for different projections and are not parallel to the long axis of the IR in the lateral projection.