Masklike face
An expressionless face with little or no sense of animation; a face that is more like a mask than a normal face. Masklike face is seen in a number of disorders, including Parkinson’s disease and myotonic dystrophy. Also known as masklike facies.
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- Masochism
The derivation of pleasure from one’s own pain. Masochism is considered a sexual disorder (paraphilia). Named after the 19th-century Austrian writer Leopold von Sacher-Masoch.
- MASS syndrome
A heritable disorder of connective tissue characterized by involvement of the mitral valve, aorta, skeleton, and skin. Hence, the acronym MASS (Mitral valve, Aorta, Skeleton, Skin). The MASS syndrome is due to a mutation in FBN1, the fibrillin 1 gene. The same gene as is mutated in Marfan syndrome.
- Massage
The therapeutic practice of manipulating the muscles and limbs to ease tension and reduce pain. Massage can be a part of physical therapy or practiced on its own. It can be effective for reducing the symptoms of disorders of or pain in the muscles and nervous system, and it is often used to reduce stress.
- Massage therapist
A person who practices therapeutic massage. In many US states, massage therapists can be licensed after completing a specified training program. Licensed therapists may practice independently or in medical settings.
- Masseter
The muscle that raises the lower jaw.