Adorable animal families that will make you aww. Cranial nerve palsy is a form of palsy involving one or more of the cranial nerves. Palsy occurs when a muscle becomes paralyzed or someone loses control of it, experiencing erratic muscle movements, spastic jerks, and other problems.n people with cranial palsy, control over a muscle or group of muscles is lost, leading to drooping, paralysis, or erratic involuntary movements. There are a number of reasons why someone might develop cranial nerve palsy.