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The presense of the mandibular medial suture/symphysis provides such evidence of mandibular fusion.

As for the orbit:

The orbit is the bony housing in which the eyeball sits. If you place your finger on your brow and press down, you will feel the edge of the orbit. By continuing to move your finger around in a circle, you can feel the orbit protection provided the eyeball on all sides, except in the front where the lids protect the eye. Between the bony housing and the eyeball are other structures such as fat, muscle, blood vessels and glands. These are known as the orbital contents.

So if you read that then you can understand how all of the components that come together to create the orbit protect they eye. They basically act as a shield to the eyeball on every side minus the very front portion. Imagine the frontal portions of the orbits as a type of bumper system. How many times have you banged the side of your head on something or hit the side of your head on something and gotten pinged on your brow right above your eye? I know I have had this happen too many times to count. It is because of that portion of the orbit that it was not my eyeball itself that took that direct hit, as the bones of the orbit protruded out further from those angles than my eyeball itself.
The back portions of the orbit (the parts you cannot see, because they are set back into the skull and the eyeball is covering them as well, serve to protect the eyeball from the back side and the side reigons by again acting as a bumper and a shiled as well as a stabelizer.