WordNet

make ones way by force; "He muscled his way into the office"
animal tissue consisting predominantly of contractile cells (同)muscular_tissue
one of the contractile organs of the body (同)musculus
authority or power or force (especially when used in a coercive way); "the senators used their muscle to get the party leader to resign"
tell a relatively insignificant lie; "Fibbing is not acceptable, even if you dont call it lying"
a trivial lie; "he told a fib about eating his spinach"; "how can I stop my child from telling stories?" (同)story, tale, tarradiddle, taradiddle
a slender and greatly elongated substance capable of being spun into yarn (同)fibre
a leatherlike material made by compressing layers of paper or cloth (同)fibre, vulcanized fiber
any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber) (同)fibre

PrepTutorEJDIC

〈U〉(動物体の組織としての)『筋肉』,筋(きん);〈C〉(体の各部を動かす)筋肉 / 〈U〉力,(特に)筋力,腕力 / 《俗に》(…に)強引に割り込む《+『in on』(『into, through』)+『名』》
(ささいな,罪のない)うそ / 軽いうそをつく
筋肉の,筋力のある / 力ずくの

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/10/03 08:09:54」(JST)

wiki en

Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors) that detect the amount and rate of change in length of a muscle.^[1] They constitute the muscle spindle and are innervated by two axons, one sensory and one motor. Intrafusal muscle fibers are walled off from the rest of the muscle by a collagen sheath. This sheath has a spindle or "fusiform" shape, hence the name "intrafusal."

There are two types of intrafusal muscle fibers: nuclear bag and nuclear chain fibers. They bear two types of sensory ending, known as annulospiral and flower-spray endings. both the ends of these fibers contract but the central region only stretches and does not contract.

They are innervated by gamma motor neurons. It is by the sensory information from these two intrafusal fiber types that one is able to judge the position of one's muscle, and the rate at which it is changing.

Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons.

References

^ Casagrand, Janet (2008) Action and Movement: Spinal Control of Motor Units and Spinal Reflexes. University of Colorado, Boulder.

External links

Histology at ucsd.edu
Histology at umdnj.edu
"Chapter 1: The Muscle Spindle and the Central Nervous System". Neuromuscular Reeducation with Electromyometric Feedback. Advanced Therapy Institute. Retrieved 30 November 2013.

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UpToDate Contents

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English Journal

The sensory innervation of the human pharynx: searching for mechanoreceptors.

de Carlos F1, Cobo J, Macías E, Feito J, Cobo T, Calavia MG, García-Suárez O, Vega JA.
Anatomical record (Hoboken, N.J. : 2007).Anat Rec (Hoboken).2013 Nov;296(11):1735-46. doi: 10.1002/ar.22792. Epub 2013 Oct 4.
The coordinate neural regulation of the upper airways muscles is basic to control airway size and resistance. The superior constrictor pharyngeal muscle (SCPM) forms the main part of the lateral and posterior walls of the pharynx and typically is devoid of muscle spindles, the main type of proprioce
PMID 24123994

Using vertebral movement and intact paraspinal muscles to determine the distribution of intrafusal fiber innervation of muscle spindle afferents in the anesthetized cat.

Reed WR1, Cao DY, Ge W, Pickar JG.
Experimental brain research.Exp Brain Res.2013 Mar;225(2):205-15. doi: 10.1007/s00221-012-3362-7. Epub 2012 Dec 11.
Increasing our knowledge regarding intrafusal fiber distribution and physiology of paraspinal proprioceptors may provide key insights regarding proprioceptive deficits in trunk control associated with low back pain and lead to more effective clinical intervention. The use of vertebral movement as a
PMID 23229776

Japanese Journal

J0205-4-6 改良型人工筋紡錘の作成と評価([J0205-4]バイオメカニズム/バイオミメティクス/バイオインスパイアー(4))

佐藤毅顕,三宅仁
年次大会講演論文集 : JSME annual meeting 2010(6), 73-74, 2010-09-04
… The muscle spindle is an invaluable displacement sensor in the living body. … In this paper, a new biomimetics tension sensor which has the characteristic muscle spindle and skeletal muscle structure and function was developed. … The biomimetic tensiometer was created by fixing the piezo actuator as intrafusal muscle fiber mimetics and strain gauge. …
NAID 110008700545

加齢によるラット錘内筋線維の形態的および組織化学的変化

豊田裕子,吉里秀雄,安藤好郎 [他],木越清信,三條俊彦,吉村篤司
日本運動生理学雑誌 15(2), 35-44, 2008-11-20
… The changes of intrafusal muscle fibers in extensor digitorun longus (EDL) of rats which occur with aging were investigated by histochemical procedures. … OD of PAS staining in all fiber types increased with aging. … In the intrafusal muscle fibers, bag_2 fibers showed a decrease of SDH activity only and chain fibers showed a decrease of GPDH activity only. …
NAID 110006987317