Now, the spinothalamic tract is a bit different, because it crosses over to the opposite side of the spinal cord 1 or 2 spinal segments above, where the 1st order neurons enter.
A preposition is often used to express the relationship between an object or an event and a location, although sometimes the relationship denoted by a preposition can be very abstract.
It could be some movement towards something, or it could be to do with being in a location and your relationship to that location. So, " at" , " I am at the supermarket."
And when the guy turned, they think that James Dean may not, because of the path of the sun, may not have even seen this car taking a left, and it was just lights out for him.