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A tremor is an involuntary, [1] somewhat rhythmic muscle contraction and relaxation involving oscillations or twitching 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 hands.
Right-handedness is the most common type. Right-handed people are more skillful with their right hands. Studies suggest that approximately 90% of people are right-handed. [7] [14] Left-handedness is less common. Studies suggest that approximately 10% of people are left-handed. [7] [15] Ambidexterity refers to having equal ability in both hands ...
Resting tremor is the most common, but kinetic tremors—occurring during voluntary movements—and postural tremor—preventing upright, stable posture—also occur. [19] Tremor largely affects the hands and feet: [ 19 ] a classic parkinsonian tremor is " pill-rolling ", a resting tremor in which the thumb and index finger make contact in a ...
Essential tremor; Other names: Idiopathic tremor: Archimedean spiral drawings by a man with a unilateral essential tremor. The spiral on the left was drawn by the subject using the left hand, and the one on the right using the right hand. Specialty: Neurology: Usual onset: Any age, but typically after 40: Causes: Unknown: Risk factors
Barbiturates slow down the central nervous system and cause tranquilizing or antiseizure effects. Phenytoin and primidone are effective antiepileptics drugs, although phenytoin can cause liver failure or have other harmful long-term effects in patients with PME. Sodium valproate is an alternative therapy for myoclonus and can be used either ...
Writer's cramp or focal hand dystonia (FHD) is an idiopathic movement disorder of adult onset, characterized by abnormal posturing and movement of the hand and/or forearm during tasks requiring skilled hand use, such as writing.
King Mithridates I Callinicus or Antiochus I of Commagene shaking hands with Hercules Dexiosis on Attic Lekythos 5th century BCE. Dexiosis (Greek: δεξίωσις dexiōsis, 'greeting' to δεξιόομαι dexioomai‚ 'to give (someone) the right (hand)' δεξιός, dexios 'right'; Latin: dextrarum iunctio‚ 'joining together of the right hands'), in the fine arts, is the representation ...
Asterixis (more colloquially referred to as flapping tremor) is not actually a tremor, but rather a negative myoclonus.This movement disorder is characterized by an inability to maintain a position, which is demonstrated by jerking movements of the outstretched hands when bent upward at the wrist (which can be similar to a bird flapping its wings, hence the name "flapping tremor").