Spasticity is usually caused by central nervous system injuries, such as brain injuries or spinal cord injuries. Spasticity is a little different from stiffness.
Oropharyngeal dysphagia, or OPD, is an impairment of the oral or pharyngeal phases of the swallow. This can impair muscle movements and coordination of the mouth, such as the lips, tongue, jaw, cheeks, palate, and also muscles of the pharynx and the entry to the airway.