WordNet

an automatic instinctive unlearned reaction to a stimulus (同)reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned_reflex, physiological reaction
a large muscle that raises the lower jaw and is used in chewing
(of leaves) bent downward and outward more than 90 degrees

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反射(刺激に対する無意識の反応) / 《複数形で》反射的な動き / (光などの)反射,反射光;映像 / 反射性の / (カメラが)レフ鋼の,反射型の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/09 09:34:42」(JST)

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The jaw jerk reflex or the masseter reflex is a stretch reflex used to test the status of a patient's trigeminal nerve (CN V).^[1] 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.

References

Nolte, J. The Human Brain, 5th ed. Mosby: Missouri; 2002, p.307. ISBN 0-323-01320-1
Blumenfeld, H. Neuroanatomy Through Clinical Cases. Sinauer Associates: Massachusetts; 2002, p. 484. ISBN 0-87893-060-4

Footnotes

^ "Neurological Examination". Retrieved 2008-02-17.

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1. 三叉神経痛 trigeminal neuralgia

English Journal

Differential involvement of two cortical masticatory areas in modulation of the swallowing reflex in rats.

Tsujimura T, Tsuji K, Ariyasinghe S, Fukuhara T, Yamada A, Hayashi H, Nakamura Y, Iwata K, Inoue M.SourceDivision of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata 951-8514, Japan. Electronic address: tsujimura@dent.niigata-u.ac.jp.
Neuroscience letters.Neurosci Lett.2012 Oct 24;528(2):159-64. doi: 10.1016/j.neulet.2012.09.005. Epub 2012 Sep 13.
To clarify the functional role of cortical descending inputs involved in the swallowing reflex, the effect of electrical stimulation of two cortical masticatory areas (CMAs: A- and P-area) on rhythmic jaw movements (RJMs) and superior laryngeal nerve (SLN)-evoked swallows were studied. RJMs and swal
PMID 22982202

Brainstem dysfunction in variegate porphyria.

Barraza G, Serranova T, Herrero C, Casanova-Mollá J, To-Figueras J, Herranz J, Valls-Solé J.SourceNeurology Department, EMG and Motor Control Unit, Hospital Clínic, Villarroel 170, Barcelona 08036, Spain.
Muscle & nerve.Muscle Nerve.2012 Sep;46(3):426-33. doi: 10.1002/mus.23367.
INTRODUCTION: Variegate porphyria (VP) is a rare metabolic disorder that may present as an acute predominantly motor neuropathy. Cranial nerves and brainstem functions have been only scarcely studied.METHODS: Brainstem reflexes were examined in symptomatic and non-symptomatic VP mutation carriers of
PMID 22907235

Japanese Journal

Relation between electrical stimulus intensity, masseteric exteroceptive reflex and sensory perception

KOMIYAMA Osamu,WANG Kelun,SVENSSON Peter,ARENDT-NIELSEN Lars,DE LAAT Antoon,UCHIDA Takashi,KAWARA Misao
Journal of prosthodontic research : official journal of the Japan Prosthodontic Society 53(2), 89-94, 2009-04-01
NAID 10028118683