Physiology

• Muscle contraction
  Muscle contraction
  Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same...
  
   and relaxation
  • Convulsion
    Convulsion
    A convulsion is a medical condition where body muscles contract and relax rapidly and repeatedly, resulting in an uncontrolled shaking of the body. Because a convulsion is often a symptom of an epileptic seizure, the term convulsion is sometimes used as a synonym for seizure...
    
    , rapid and repeated muscle contraction and relaxation, resulting in uncontrolled shaking
  • Fasciculation
    Fasciculation
    A fasciculation , or "muscle twitch", is a small, local, involuntary muscle contraction and relaxation visible under the skin arising from the spontaneous discharge of a bundle of skeletal muscle fibers...
    
    , a small, local, involuntary muscle contraction
  • Myoclonic twitch, a jerk usually caused by sudden muscle contractions
  • Myokymia
    Myokymia
    Myokymia, is an involuntary, spontaneous, localized quivering of a few muscles bundles within a muscle, but which are insufficient to move a joint.One type is superior oblique myokymia....
    
    , a continuous, involuntary muscle twitch that affects the muscles of the face, particularly the eyelids
  • Spasm
    Spasm
    In medicine a spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ, or a similarly sudden contraction of an orifice. It is sometimes accompanied by a sudden burst of pain, but is usually harmless and ceases after a few minutes...
    
    , a sudden, involuntary contraction of a muscle, group of muscles, hollow organ, or orifice
  • Tic
    Tic
    A tic is a sudden, repetitive, nonrhythmic, stereotyped motor movement or vocalization involving discrete muscle groups. Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing...
    
    , an involuntary, repetitive, nonrhythmic movement or vocalization of sudden onset and involving discrete muscle groups
  • Tremor
    Tremor
    A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving to-and-fro movements of one or more body parts. It is the most common of all involuntary movements and can affect the hands, arms, eyes, face, head, vocal folds, trunk, and legs. Most tremors occur in the...
    
    , an involuntary, repetitive, somewhat rhythmic, muscle contraction and relaxation

Entertainment

• Twitch (film)
  Twitch (film)
  Twitch is a Student Academy Award nominated short film directed by Leah Meyerhoff.Twitch kicked off the film festival circuit by winning a Grand Jury Prize at Slamdance and going on to screen in over 200 film festivals worldwide...
  
  , a 2005 short film directed by Leah Meyerhoff
• Twitch (Ministry album), 1986
• Twitch (Aldo Nova album)
  Twitch (Aldo Nova album)
  Twitch is the third studio album by Canadian rock musician Aldo Nova, released in 1985.-Track listing:# "Tonight " 4:16# "Rumors of You" 4:55# "Surrender Your Heart" 4:26...
  
  , 1985
• Twitch (EP)
  Twitch (EP)
  Twitch is an EP and the first official release by Australian alternative rock band Jebediah, released on 5 August 1996. It peaked at No. 61 on the ARIA Singles Chart. It debuted at No. 1 in the Western Australia ARIA chart.-Track listing:...
  
  , by Jebediah
• Twitch Film
  Twitch Film
  Twitch Film, also known simply as Twitch, is an English language Canadian website featuring news and reviews of mainly international, independent and cult films. The website was founded in 2004 by Todd Brown, a cinephile with personal interests in arthouse and grindhouse cinema...
  
  , a film website

Nicknames

• Stephen "Twitch" Boss, American dancer, finalist in the fourth season of the TV series So You Think You Can Dance
• Richard Roy (musician), American bass guitarist, formerly of Sum 41
• Jeremy Stenberg
  Jeremy Stenberg
  Jeremy "Twitch" Stenberg is a professional freestyle motocross rider and professional off-road truck racer. Stenberg received his nickname 'Twitch' from his Tourette's syndrome, which he was diagnosed with at the age of eight...
  
   (born 1981), American professional freestyle motocross rider
• Maximilian "Twitch" Williams, a fictional police officer in the comic series Sam and Twitch
  Sam and Twitch
  Sam Burke and Maximilian "Twitch" Williams are two fictional NYPD homicide Detectives, created by Todd McFarlane. Sam and Twitch were originally featured in McFarlane's hit comic series Spawn. Due to their popularity, they were later given their own title in 1999, called Sam and Twitch...
  
  , a spinoff of Spawn

Other uses

• Twitch (device)
  Twitch (device)
  A twitch is a device that is used to restrain horses for various stressful situations, such as veterinary treatment. It is usually made up of a stick-like handle loop of chain or rope on the end, or a metal ring with a rope loop which is wrapped around the upper lip of the horse and tightened...
  
  , a device used to restrain horses
• Twitch, in birdwatching, to pursue and observe a rare bird
• Twitch gameplay, a computer or video game in which the player must react quickly