patellar reflex
Definition
Noun: A reflex extension of the leg resulting from a sharp tap on the patellar tendon. It is an involuntary, automatic muscle contraction, specifically a deep tendon reflex, that tests the function of the nerves and spinal cord segments associated with the knee.
Usage
The term is used primarily in medical, physiological, and clinical contexts to describe a specific neurological test or the involuntary response itself. - It is typically used as a singular noun. - It is often preceded by verbs like "test," "elicit," "check," or "demonstrate."
Examples
- Noun:
- The doctor tested the patellar reflex by tapping just below my kneecap.
- An absent patellar reflex can indicate a problem with the nervous system.
- The patellar reflex is also commonly known as the knee-jerk reflex.
Advanced Usage
- Clinical Assessment: In a neurological exam, the patellar reflex is graded on a scale (e.g., 0 for absent, 4+ for hyperactive) to assess spinal cord integrity.
- Physiological Principle: The patellar reflex is a classic example of a monosynaptic reflex arc involving sensory and motor neurons.
Variants and Related Words
- Knee-jerk reflex: A common synonym for the patellar reflex.
- Deep tendon reflex (DTR): A broader category of reflexes that includes the patellar reflex.
- Reflex hammer: The medical instrument used to elicit the patellar reflex.
Synonyms
- Knee-jerk reflex
- Knee reflex
Related Phrases
- Elicit a patellar reflex: To cause the reflex to occur by tapping the tendon.
- Hyperactive patellar reflex: A reflex that is more pronounced than normal.
- Diminished patellar reflex: A reflex that is weaker than expected.
Noun
-
a reflex extension of the leg resulting from a sharp tap on the patellar tendon
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