Palsy is a medical term derived from the word paralysis that is defined as paralysis of a body part often accompanied by loss of feeling and uncontrolled body movements such as shaking. It occurs in the name of several medical conditions including cerebral palsy (caused by some intracranial lesions), brachial palsy (paralysis of an arm) and Bell's palsy. Paralysis is the complete loss of muscle function for one or more muscle groups. ... The somatosensory system is the sensory system of somatic sensation. ... Cerebral palsy or CP is the most common childhood physical disability. ... A lesion is a non-specific term referring to abnormal tissue in the body. ... Bells palsy (facial palsy) is characterised by facial drooping on the affected half, due to malfunction of the facial nerve (VII cranial nerve), which controls the muscles of the face. ...