Myalgia is not a medical disorder or disease but more of a symptom of an existing underlying condition. Myalgia is known as a muscle ache or muscle pain. It is a common condition that almost everyone has had at one time or another.
Gyri and Sulci. Gyri and Sulci are compliments of each other in the sense that they help create each other. The gyri (single gyrus) are the actual pieces of the brain's cerebrum which have been smooshed and curved into fine folds so that more surface area is available on the cerebrum. Sulci are the shallow grooves which are formed between these smooshed folds.
Souvlaki is a see also of gyro. As nouns the difference between souvlaki and gyro. is that souvlaki is any of several greek dishes such as kalamaki, giros, kebab and shawarma while gyro is a gyroscope or gyro can be a style of greek sandwich commonly filled with grilled meat, tomato, onions, and tzatziki sauce.