Science, Tech, Math › Science Biology Prefixes and Suffixes: My- or Myo- Share Flipboard Email Print This is a colored scanning electron micrograph (SEM) of a skeletal, or striated, muscle fiber. Steve Gschmeissner/Science Photo Library/Getty Images Science Biology Basics Cell Biology Genetics Organisms Anatomy Physiology Botany Ecology Chemistry Physics Geology Astronomy Weather & Climate By Regina Bailey Biology Expert B.A., Biology, Emory University A.S., Nursing, Chattahoochee Technical College Regina Bailey is a board-certified registered nurse, science writer and educator. Her work has been featured in "Kaplan AP Biology" and "The Internet for Cellular and Molecular Biologists." our editorial process Regina Bailey Updated May 11, 2019 The prefix myo- or my- means muscle. It is used in a number of medical terms in reference to muscles or muscle-related disease. Words Beginning With (Myo- or My-) Myalgia (my-algia): The term myalgia means muscle pain. Myalgia may occur due to muscle injury, overuse, or inflammation. Myasthenia (my-asthenia): Myasthenia is a disorder that causes muscle weakness, typically of voluntary muscles in the face. Myoblast (myo-blast): The embryonic cell layer of the mesoderm germ layer that develops into muscle tissue is called myoblast. Myocarditis (myo-card-itis): This condition is characterized by inflammation of the muscular middle layer (myocardium) of the wall of the heart. Myocardium (myo-cardium): The muscular middle layer of the wall of the heart. Myocele (myo-cele): A myocele is a protrusion of a muscle through its sheath. It is also called a muscle hernia. Myoclonus (myo-clonus): A brief involuntary contraction of a muscle or muscle group is known as myoclonus. These muscle spasms occur suddenly and randomly. A hiccup is an example of a myoclonus. Myocyte (myo-cyte): A myocyte is a cell that is found in muscle tissue. Myodystonia (myo-dystonia): Myodystonia is a muscle tone disorder. Myoelectric (myo-electric): This terms refers to the electrical impulses that generate muscle contractions. Myofibril (myo-fibril): A myofibril is a long, thin muscle fiber thread. Myofilament (myo-fil-ament): A myofilament is a myofibril filament composed of actin or myosin proteins. It plays an important role in the regulation of muscle contractions. Myogenic (myo-genic): This term means originating in or arising from the muscles. Myogenesis (myo-genesis): Myogenesis is the formation of muscle tissue occurring in embryonic development. Myoglobin (myo-globin): Myoglobin is the oxygen-storing protein found in muscle cells. It is only found in the bloodstream following a muscle injury. Myogram (myo-gram): A myogram is a graphical recording of muscle activity. Myograph (myo-graph): The instrument for recording muscle activity is known as a myograph. Myoid (my-oid): This term means resembling muscle or muscle-like. Myolipoma (myo-lip-oma): This is a type of cancer that consists partly of muscle cells and mostly of adipose tissue. Myology (myo-logy): Myology is the study of muscles. Myolysis (myo-lysis): This term refers to the breakdown of muscle tissue. Myoma (my-oma): A benign cancer consisting primarily of muscle tissue is called a myoma. Myomere (myo-mere): A myomere is a section of skeletal muscle that is separated from other myomeres by layers of connective tissue. Myometrium (myo-metrium): Myometrium is the middle muscular layer of the uterine wall. Myonecrosis (myo-necrosis): The death or destruction of muscle tissue is known as myonecrosis. Myorrhaphy (myo-rrhaphy): This term refers to the suture of muscle tissue. Myosin (myo-sin): Myosin is the primary contractile protein in muscle cells that enables muscle movement. Myositis (myos-itis): Myositis is muscle inflammation that causes swelling and pain. Myotome (myo-tome): A group of muscles connected by the same nerve root is called a myotome. Myotonia (myo-tonia): Myotonia is a condition in which the ability to relax a muscle is impaired. This neuromuscular condition may impact any muscle group. Myotomy (my-otomy): A myotomy is a surgical procedure that involves the cutting of a muscle. Myotoxin (myo-toxin): This is a type of toxin produced by venomous snakes that causes muscle cell death.