WordNet

move with abrupt, seemingly uncontrolled motions; "The patients legs were jerkings" (同)twitch
(mechanics) the rate of change of acceleration
an abrupt spasmodic movement (同)jerking, jolt, saccade
raising a weight from shoulder height to above the head by straightening the arms
a dull stupid fatuous person (同)dork
throw or toss with a quick motion; "flick a piece of paper across the table"; "jerk his head" (同)flick
any skeletal muscle having two origins (but especially the muscle that flexes the forearm)

PrepTutorEJDIC

(急に)『ぐいっと引っぱる』(『押す』,『ねじる』,『投げる』)『こと』 / (筋肉の)反射運動;けいれん / 《米俗》うぶな人;まぬけ / (重量挙げの)ジャーク / 《運動を表す副詞[句]を伴って》…‘を'『急に引っぱる』(『押す』,『ねじる』,『投げる』) / …‘を'ぶっきらぼうに(投げ出すように)言う《+『out』+『名,』+『名』+『out』》 / 『急に』(『ぐいっと』)『動く』
〈特に牛肉〉‘を'細切りにして干し肉にする
(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）』「2014/12/03 15:10:04」(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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1. 二頭筋腱障害および腱断裂 biceps tendinopathy and tendon rupture
2. 律動眼振 jerk nystagmus
3. 新生児の神経学的検査 neurologic examination of the newborn
4. 幼児および小児における精密な神経学的評価 detailed neurologic assessment of infants and children
5. 眼振の概要 overview of nystagmus

English Journal

Modified Open Suprapectoral EndoButton Tension Slide Tenodesis Technique of Long Head of Biceps with Restored Tendon Tension-Length.

Prabhu J1, Faqi MK1, Awad RK1, Alkhalifa F1.
The open orthopaedics journal.Open Orthop J.2017 Mar 31;11:281-290. doi: 10.2174/1874325001711010281. eCollection 2017.
PMID 28567157

An Isolated Displaced Fracture of the Coracoid Process Treated with Open reduction and internal fixation - A Case Report and Review of Literature.

Archik S1, Nanda SN1, Tripathi S1, Choudhari A1, Rajadhyaksha H2.
Journal of orthopaedic case reports.J Orthop Case Rep.2016 Jan-Mar;6(1):37-9. doi: 10.13107/jocr.2250-0685.372.
PMID 27299123

Novel mutation in the ATL1 with autosomal dominant hereditary spastic paraplegia presented as dysautonomia.

Shin JW1, Jung KH1, Lee ST1, Moon J1, Seong MW2, Park SS2, Lee SK1, Chu K3.
Autonomic neuroscience : basic & clinical.Auton Neurosci.2014 Oct;185:141-3. doi: 10.1016/j.autneu.2014.06.001. Epub 2014 Jun 9.
PMID 24969372