16 Questions
What can result in facial weakness or paralysis?
Both a peripheral and central lesion
Where can a peripheral lesion of CN VII occur?
Anywhere from its origin in the pons to its periphery in the face
How is a central lesion involving the upper motor neuron system different from a peripheral lesion?
It weakens the right lower face but preserves function in the upper face
What happens to the upper portion of the face in a central nerve damage to CN VII?
It continues to function fairly well
What effect does peripheral nerve damage to CN VII have on the forehead?
It paralyzes the forehead
How is left hemispheric damage to upper motor neurons different from right hemispheric damage?
It weakens only the lower portion of the face on one side
Which type of muscle tone is rate-dependent, increasing with rapid passive movement and decreasing with slow passive movement?
Spasticity
What is the term for the increased resistance that persists throughout the movement arc, independent of the rate of movement?
Lead-pipe rigidity
Which condition is characterized by loss of muscle tone causing the limb to be loose or floppy?
Flaccidity
What term is used for a superimposed ratchet-like jerkiness during flexion and extension of the wrist or forearm?
Cogwheel rigidity
Sudden changes in tone accompanying passive range of motion include sudden loss of tone that increases the ease of motion, known as:
Mitgehen
Where is the location of lesion associated with disorders of muscle tone such as spasticity, rigidity, and flaccidity?
Motor cortex
What condition is characterized by sudden increase in tone making motion more difficult?
Gegenhalten
Which disease is a common cause of spasticity, rigidity, and flaccidity?
Stroke
What condition causes the affected limbs to be hyperextensible or even flail-like?
Flaccidity
What is the term used for initial hypertonia giving way suddenly as the limb relaxes during rapid passive movement?
Clasp-knife resistance
This quiz explores the differences between peripheral and central lesions causing facial weakness or paralysis. It covers the impacts of lesions on the upper motor neuron system and CN VII, the facial nerve.
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