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| Palmomental reflex ： ウィキペディア英語版 |
Palmomental reflex
The palmomental reflex (PMR) is a primitive reflex consisting of a twitch of the chin muscle elicited by stroking a specific part of the palm. It is present in infancy and disappears as the brain matures during childhood but may reappear due to processes that disrupt the normal cortical inhibitory pathways. Therefore it is an example of a frontal release sign.
==Research==
Marinesco and Radovici in their seminal paper hypothesize that both the afferent (receptive) and efferent (motor) arms of the reflex are on the same side (ipsilateral) to the hand stimulated; however this hypothesis remains unsubstantiated.
The PMR has been found to be present more frequently in various neurological conditions both localized and diffuse. These include congenital conditions such as Down's syndrome where it is unclear whether the reflex persists throughout life or disappears and then re-appears in association with the onset of Alzheimer's disease pathology. The reflex is common in the elderly population and should not be taken as indicative of a dementing process.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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