Can a MRI of spine detect aneurysm and nerve disorders?

Possibly. Magnetic resonance imaging, is a non-invasive, non-radiation method of cross section imaging. It is used to look at soft tissues, blood vessels and bone. Mri spine imaging will look at bone and the spinal cord with spinal nerves cords. An aneurysm is a blood vessel defect, usually of an artery such as the aorta, which lies in front of the spine. Whether this is seen depends on the image window.
Unclear . So you mean spinal aneurysms? These are very crate but you can sometimes see them on a cervical spine MRI if they are big enough. You an also see spinal nerves being pinched in the neck as well.