jaw clonus reflex - significado y definición. Qué es jaw clonus reflex
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Qué (quién) es jaw clonus reflex - definición

Jaw jerk; Masseter reflex; Jaw jerk reflexes

Jaw jerk reflex         
The jaw jerk reflex or the masseter reflex is a stretch reflex used to test the status of a patient's trigeminal nerve (cranial nerve V) and to help distinguish an upper cervical cord compression from lesions that are above the foramen magnum. The mandible—or lower jaw—is tapped at a downward angle just below the lips at the chin while the mouth is held slightly open.
Flinching         
  • An example of reflex reversal is depicted. Activating the same spinal reflex pathway can cause limb flexion while standing, and extension while walking.
  • The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
AUTOMATIC, SUBCONSCIOUS RESPONSE TO A STIMULUS
Reflex reaction; Reflexes; Reflex test; Reflectory reaction; Reflectory; Reflex, abnormal; Reflex action; Medical reflex; Body reflexes; Instinctive reflex; Involuntary action; Reflex response; Involuntary behavior; Human reflex; Flinching
·p.pr. & ·vb.n. of Flinch.
Withdrawal reflex         
SPINAL REFLEX
Pain withdrawal reflex; Pain Withdrawal Reflex; Nociceptor reflex; Flexor reflex; Flexion reflex; Nociceptive flexion reflex; RIII reflex; Nociceptive flexion response
The withdrawal reflex (nociceptive flexion reflex or flexor withdrawal reflex) is a spinal reflex intended to protect the body from damaging stimuli. The reflex rapidly coordinates the contractions of all the flexor muscles and the relaxations of the extensors in that limb causing sudden withdrawal from the potentially damaging stimulus.

Wikipedia

Jaw jerk reflex

The jaw jerk reflex or the masseter reflex is a stretch reflex used to test the status of a patient's trigeminal nerve (cranial nerve V) and to help distinguish an upper cervical cord compression from lesions that are above the foramen magnum. The mandible—or lower jaw—is tapped at a downward angle just below the lips at the chin while the mouth is held slightly open. In response, the masseter muscles will jerk the mandible upwards. Normally this reflex is absent or very slight. However, in individuals with upper motor neuron lesions the jaw jerk reflex can be quite pronounced.

The jaw jerk reflex can be classified as a dynamic stretch reflex. As with most other reflexes, the response to the stimulus is monosynaptic, with sensory neurons of the trigeminal mesencephalic nucleus sending axons to the trigeminal motor nucleus, which in turn innervates the masseter. This reflex is used to judge the integrity of the upper motor neurons projecting to the trigeminal motor nucleus. Both the sensory and motor aspects of this reflex are through CN V.

It is not part of a standard neurological examination. It is performed when there are other signs of damage to the trigeminal nerve.

The clinical presentation of cervical spondylotic myelopathy can be similar to multiple sclerosis (MS) or amyotrophic lateral sclerosis (ALS), however, a hyperactive jaw reflex suggests the pathology is above the foramen magnum. In other words, a normal jaw jerk reflex points the diagnosis toward cervical spondylotic myelopathy and away from MS or ALS.