What happens if motor neurons are damaged?

Damage to lower motor neuron cell bodies or their peripheral axons results in paralysis (loss of movement) or paresis (weakness) of the affected muscles.

Why are reflexes increased in upper motor neuron lesions?

Because of the loss of inhibitory modulation from descending pathways, the myotatic (stretch) reflex is exaggerated in upper motor neuron disorders.

Which of the following symptoms would appear in a patient who had suffered damage to the motor pathway of a reflex arc?

Spasticity is increased muscle tone, hyperactive stretch reflexes, and clonus (an oscillatory motor response to muscle stretching). Extensive upper motor neuron lesions may also be accompanied by rigidity of the extensor muscles of the leg and the flexor muscles of the arm (called decerebrate rigidity; see below).

What are pathological reflexes?

Pathologic reflexes (eg, Babinski, Chaddock, Oppenheim, snout, rooting, grasp) are reversions to primitive responses and indicate loss of cortical inhibition. Babinski, Chaddock, and Oppenheim reflexes all evaluate the plantar response. The normal reflex response is flexion of the great toe.

What are the four types of motor neuron disorders?

The disease can be classified into four main types depending on the pattern of motor neurone involvement and the part of the body where the symptoms begin.

Amyotrophic lateral sclerosis (ALS)
Progressive bulbar palsy (PBP)
Progressive muscular atrophy (PMA)
Primary lateral sclerosis (PLS)

What were your first signs of MND?

Early symptoms can include:

weakness in your ankle or leg – you might trip, or find it harder to climb stairs.
slurred speech, which may develop into difficulty swallowing some foods.
a weak grip – you might drop things, or find it hard to open jars or do up buttons.
muscle cramps and twitches.

What is a neurological reflex?

A reflex is an involuntary and nearly instantaneous movement in response to a stimulus. The reflex is an automatic response to a stimulus that does not receive or need conscious thought as it occurs through a reflex arc. Reflex arcs act on an impulse before that impulse reaches the brain.

What is the most common motor neuron disease?

Each kind of motor neuron disease affects different types of nerve cells or has a different cause. ALS is the most common of these diseases in adults.

What do MND twitches feel like?

Twitching or a sensation of rippling under the skin can happen with MND, but also with tiredness, stress, viral infection or general ill health. Sometimes one area of the body twitches, or several areas can twitch at once.

What happens if motor neurons are damaged? Damage to lower motor neuron cell bodies or their peripheral axons results in paralysis (loss of movement) or paresis (weakness) of the affected muscles. Why are reflexes increased in upper motor neuron lesions? Because of the loss of inhibitory modulation from descending pathways, the myotatic (stretch) reflex is…