WordNet

an automatic instinctive unlearned reaction to a stimulus (同)reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned_reflex, physiological reaction
any skeletal muscle having two origins (but especially the muscle that flexes the forearm)
(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
(手足の)二頭筋

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/10/02 20:53:50」(JST)

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Biceps reflex is a reflex test that examines the function of the C5 reflex arc and the C6 reflex arc.^[1] The test is performed by using a tendon hammer to quickly depress the biceps brachii tendon^[2] as it passes through the cubital fossa. Specifically, the test activates the stretch receptors inside the biceps brachii muscle which communicates mainly with the C5 spinal nerve and partially with the C6 spinal nerve to induce a reflex contraction of the biceps muscle and jerk of the forearm.

A strong contraction indicates a 'brisk' reflex, and a weak or absent reflex is known as 'diminished'. Brisk or absent reflexes are used as clues to the location of neurological disease. Typically brisk reflexes are found in lesions of upper motor neurones, and absent or reduced reflexes are found in lower motor neurone lesions.

A change to the biceps reflex indicates pathology at the level of musculocutaneous nerve, segment C5/6 or at some point above it in the spinal cord or brain.

References

^ William J. Weiner (30 July 2010). Neurology for the Non-Neurologist. Lippincott Williams & Wilkins. pp. 499–. ISBN 978-1-60547-239-3. Retrieved 4 July 2011.
^ Jane M. Orient (2009). Sapira's Art and Science of Bedside Diagnosis. Lippincott Williams & Wilkins. pp. 570–. ISBN 978-1-60547-411-3. Retrieved 4 July 2011.

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UpToDate Contents

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1. 成人における詳細な神経学的検査 the detailed neurologic examination in adults
2. 肩部の身体診察 physical examination of the shoulder
3. 二頭筋腱障害および腱断裂 biceps tendinopathy and tendon rupture
4. 小児および思春期における陰嚢損傷 scrotal trauma in children and adolescents
5. 進行性核上性麻痺（PSP） progressive supranuclear palsy psp

English Journal

Auditory startle reflex and startle reflex to somatosensory inputs in generalized dystonia.

Kiziltan ME1, Gunduz A2, Apaydın H1, Ertan S1, Kiziltan G1.
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology.Clin Neurophysiol.2015 Sep;126(9):1740-5. doi: 10.1016/j.clinph.2014.11.004. Epub 2014 Nov 15.
OBJECTIVE: Startle reflex is a generalized defense reaction after unexpected auditory, visual, or tactile stimuli. Auditory startle reflex (ASR) and startle reflex to somatosensory inputs (SSS) have never been studied in generalized dystonia. Here, we aimed to study the characteristics and changes o
PMID 25534494

Short-latency crossed responses in the human biceps femoris muscle.

Stevenson AJ1, Kamavuako EN1, Geertsen SS2,3, Farina D4, Mrachacz-Kersting N1.
The Journal of physiology.J Physiol.2015 Aug 15;593(16):3657-71. doi: 10.1113/JP270422.
KEY POINTS: The present study is the first to show short-latency crossed-spinal reflexes in the human upper leg muscles following mechanical rotations to the ipsilateral knee (iKnee) joint. The short-latency reflex in the contralateral biceps femoris (cBF) was inhibitory following iKnee extension pe
PMID 25970767

Contributions of motoneuron hyperexcitability to clinical spasticity in hemispheric stroke survivors.

Hu X1, Suresh NL2, Chardon MK2, Rymer WZ3.
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology.Clin Neurophysiol.2015 Aug;126(8):1599-606. doi: 10.1016/j.clinph.2014.11.005. Epub 2014 Nov 15.
OBJECTIVE: Muscle spasticity is one of the major impairments that limits recovery in hemispheric stroke survivors. One potential contributing mechanism is hyperexcitability of motoneurons. Previously, the response latency of the surface electromyogram (EMG) record evoked by joint rotation has been u
PMID 25438885