Motor Speech Disorders (MSD) are a group of speech and voice disorders that occur as a result of damage to the brain or other parts of the nervous system. The severity of a MSD may range from very mild to very severe.
There are many different causes of an acquired MSD, including progressive neurological conditions such as;
Or a MSD may occur suddenly as a result of an acute trauma to the nervous system, for example;
Motor Speech Disorder or MSD is an umbrella term to describe dysarthria and apraxia of speech
There are two main types of MSDs;
Apraxia of speech (AOS) is a disorder that affects the pathways in the brain involved in planning and sequencing speech. A person with AOS has trouble saying what they want to say correctly and consistently. The person knows what they want to say, but cannot properly plan and sequence the speech sound movements they need e.g. the lip and tongue movements.
Dysarthria is a group of disorders caused by weakness, slowness, or lack of coordination in the muscles involved in producing speech, including the muscles of the jaw, tongue, lips, voice and breathing system. Dysarthria can alter a person's speech clarity, naturalness, speed, volume, pitch and resonance.
The SLT plays an important role in the diagnosis and treatment of people with MSDs. A person may have both dysarthria and AOS, which makes the diagnosis and the treatment of the two disorders more difficult. The SLT’s role may include;