When modifying the pa axial projection of the skull to demonstrate superior orbital fissures, the central ray is directeda 20° to 25° caudad. b 20° to 25° cephalad. c 30° to 35° caudad. d 30° to 35° cephalad.

20° to 25° caudad.

Explanation:

The axial projection of the skull can be demonstrated by the X-Ray and radiography. This axial projection is important for diagnosing any medical condition.

The superior orbital fissure angle plays an important role in PA axial projection. The central ray should be directed to the 20° to 25° caudad in the modification of PA axial projection.

Thus, the correct answer is option (A).

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explanation: