The difference between descending cortical ankylosis and descending cerebral ankylosis mainly lies in the site of lesion, typical signs and clinical manifestations. 1. Site of lesion: Decorticotonic ankylosis is damage to the cerebral cortex, while diencephalic ankylosis is damage to the midbrain. 2. Typical signs: Decorticate ankylosis often manifests as upper limb shoulder, wrist and finger flexion, lower limb straightening, foot flexion, often accompanied by pathological signs; decerebrate ankylosis often manifests as neck tilt back, limb straightening, muscle tension so that it is impossible to break. 3. Clinical manifestations: decorticate ankylosis is often manifested as the ability to open and close the eyes, light reflex and corneal reflex exists, but the external stimulation is ineffective, unable to control speech and movement; decerebrate ankylosis is usually manifested as a coma, and accompanied by irregular respiration, muscle twitching and other symptoms. It is important to note that decorticate ankylosis and dystocia can be transformed into each other. When symptoms occur, it is recommended to consult a doctor in time to find out the cause of the disease and treat it actively.