Final answer:
The angle formed between the petrous pyramids and the MSP in the average human skull is approximately 45 degrees.
Step-by-step explanation:
The angle formed between the petrous pyramids and the MSP (Midsagittal Plane) in the average human skull is approximately 45 degrees. The petrous pyramids are located on the lateral aspects of the skull and house the middle and inner ear structures. The MSP is an imaginary vertical plane that divides the skull into left and right halves.