Motion sickness
A disorder of the sense of balance and equilibrium and, hence, the sense of spatial orientation that is caused by repeated motion such as from the swell of the sea, the movement of a car, or the motion of a plane in turbulent air. Motion sickness is due to irritation of a portion of the inner ear called the labyrinth. The symptoms of motion sickness include nausea, vomiting, and vertigo. Other common signs of motion sickness are sweating and a general feeling of discomfort and not feeling well (malaise). Symptoms usually stop when the motion that causes it ceases. However, some people suffer symptoms for even a few days after the trip is over.
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- Motion, range of
The full movement potential of a joint, usually its range of flexion and extension. For example, a knee might lack 10 degrees of full extension due to an injury.
- Motor
Something that produces or refers to motion. For example, a motor neuron is a nerve cell that conveys an impulse to a muscle for contraction, which then moves a joint.
- Motor neuron
A neuron that sends electrical output signals to muscle neurons. Also called a motoneuron.
- Motor neuron disease
A group of related diseases of the nervous system that are characterized by steadily progressive deterioration of the motor neurons in the brain, brainstem, and spinal cord. Abbreviated MND. Motor neurons are the nerve cells along which the brain sends instructions, in the form of electrical impulses, to the muscles. The degeneration of motor neurons […]
- Motor neurone disease
Motor neuron disease. “His suffering from motor neurone disease (MND) was finally over because he had chosen to die.” (article by Lesley Close in The Guardian, May 25, 2004)