Any functional anomaly of the muscle tissue.
http://purl.obolibrary.org/obo/UPHENO_0002356
http://purl.obolibrary.org/obo/UPHENO_0002303
http://purl.obolibrary.org/obo/UPHENO_0002720
http://purl.obolibrary.org/obo/UPHENO_0002252