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The first of the two main groups of stretch receptors wrapping the intrafusal fibers are the Ia fiber, which are the largest and fastest fibers, and they fire when the muscle is stretching. They are characterized by their rapid adaptation, because as soon as the muscle stops changing length, the Ia
410:
Purves, Dale; Augustine, George J; Fitzpatrick, David; Hall, William C; Lamantia, Anthony Samuel; Mooney, Richard D; Platt, Michael L; White, Leonard E, eds. (2018). "Chapter 9 - The
Somatosensory System: Touch and Proprioception".
81:. Muscle spindles are a type of proprioceptor, and they are found inside the muscle itself. They lie parallel with the contractile fibers. This gives them the ability to monitor muscle length with precision.
53:, which constantly monitors the rate at which a muscle stretch changes. The information carried by type Ia fibers contributes to the sense of
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bifurcating into ascending and descending branches, which in turn send branches to multiple spinal segments. Some branches
415:(6th ed.). Sinauer Associates. Central Pathways Conveying Proprioceptive Information from the Body, pp. 204-205.
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stop firing and adapt to the new length. Ia fibers essentially supply proprioceptive information about the
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The two kinds of sensory fibers are different with respect to the kind of potentials they generate:
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Respond to the rate of change in muscle length, as well as to change in velocity, rapidly adapting
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73:. In order to receive a continuous stream of sensory data, the body has developed special
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175:. These connections are also called "annulospiral endings", deriving from the Latin word
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has to have a constant input of sensory data coming from areas such as the muscles and
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of its respective muscle: the derivative of the muscle's length (or position).
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This change in length of the spindle is transduced (transformed into electric
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In addition, the spindle also has a motor efferent innervation carried by the
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93:) by two types of sensory afferents, whose cell bodies are located in
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Provide position sense of a still muscle, fire when muscle is static
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Boyd, I. A. (1980). "The isolated mammalian muscle spindle".
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For the body to keep moving properly and with finesse, the
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A muscle spindle, with γ motor and Ia sensory fibers
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227:are) which mediate different responses including
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179:which means "a ring-shaped area or structure".
60:
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442:from John D.C. Lambert on neurophysiology.
360:Nervous System: Systems of the Body Series
84:
314:
20:
182:
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203:Proprioceptive afferents send central
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142:, responds to muscle tension changes
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13:
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235:have some similarities with the
637:Oligodendrocyte progenitor cell
356:Michael-Titus, Adina T (2007).
167:Type Ia fibers connect to both
41:. It is the sensory fiber of a
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243:which controls the timings of
1:
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231:. Ascending pathways to the
335:10.1016/0166-2236(80)90096-X
16:Type of afferent nerve fiber
7:
747:Postganglionic nerve fibers
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209:dorsal root of spinal nerve
61:Function of muscle spindles
10:
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742:Preganglionic nerve fibers
1252:Olfactory receptor neuron
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916:Neurofibril/neurofilament
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364:. Churchill Livingstone.
247:for voluntary movements.
199:Termination of afferents
323:Trends in Neurosciences
257:Intrafusal muscle fiber
85:Types of sensory fibers
1199:Neuromuscular junction
1062:III or Aδ or fast pain
386:"annulus - Wiktionary"
35:primary afferent fiber
26:
302:Posterior grey column
262:Type II sensory fiber
189:efferent nerve fibers
31:type Ia sensory fiber
24:
1217:Meissner's corpuscle
1182:Postsynaptic density
1079:Efferent nerve fiber
1067:IV or C or slow pain
1009:Afferent nerve fiber
835:Satellite glial cell
183:Efferent innervation
173:nuclear chain fibers
97:located next to the
39:afferent nerve fiber
1222:Merkel nerve ending
245:muscle contractions
237:cutaneous afferents
193:gamma motor neurons
95:dorsal root ganglia
91:membrane potentials
1257:Photoreceptor cell
1227:Pacinian corpuscle
1158:Electrical synapse
1112:Lower motor neuron
1107:Upper motor neuron
828:Internodal segment
768:Connective tissues
738:Autonomic ganglion
267:Gamma motor neuron
169:nuclear bag fibers
140:Golgi tendon organ
27:
1279:
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1275:
1274:
1242:Free nerve ending
1209:Sensory receptors
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1052:Ib or Golgi or Aα
960:
959:
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720:Ramus communicans
659:
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525:Commissural fiber
520:Association fiber
515:Projection fibers
390:en.wiktionary.org
272:Beta motor neuron
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113:Primary/secondary
75:sensory receptors
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1172:Synaptic vesicle
1167:Chemical synapse
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1057:II or Aβ and Aγ
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946:Apical dendrite
941:Dendritic spine
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823:Node of Ranvier
818:Myelin incisure
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642:Oligodendrocyte
625:Ependymal cells
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329:(11): 258–277.
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277:Proprioception
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229:stretch reflex
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162:rate of change
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79:proprioceptors
67:nervous system
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1127:γ motorneuron
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440:Lecture notes
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371:9780443071799
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225:motor neurons
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1162:Gap junction
1084:Motor neuron
1046:
878:Axon hillock
854:nerve fibers
808:Schwann cell
718:
701:
679:
597:Medium spiny
510:White matter
498:Tissue Types
413:Neuroscience
412:
405:
393:. Retrieved
389:
380:
359:
351:
326:
322:
316:
282:Motor system
221:ventral horn
207:through the
202:
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176:
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103:
88:
64:
34:
30:
28:
18:
1177:Active zone
1142:Termination
992:Interneuron
896:Telodendron
804:Myelination
786:Endoneurium
781:Perineurium
602:Interneuron
592:Von Economo
540:Decussation
535:Nerve tract
505:Grey matter
395:October 22,
223:(where the
217:dorsal horn
99:spinal cord
45:called the
1247:Nociceptor
987:Multipolar
936:Nissl body
813:Neurilemma
776:Epineurium
561:Cell Types
308:References
241:cerebellum
1262:Hair cell
796:Neuroglia
758:Funiculus
647:Microglia
620:Astrocyte
577:Pyramidal
530:Lemniscus
150:secondary
116:Response
49:found in
1286:Category
1047:Ia or Aα
977:Unipolar
926:Dendrite
911:Axolemma
906:Axoplasm
690:Ganglion
630:Tanycyte
582:Purkinje
569:Neuronal
552:Meninges
547:Neuropil
343:53199331
251:See also
1189:Autapse
1150:Synapse
997:Renshaw
972:Bipolar
849:Neurons
702:Ventral
673:General
587:Granule
215:at the
213:synapse
177:annulus
147:Type II
132:Type Ib
124:primary
121:Type Ia
77:called
51:muscles
33:, or a
1042:fibers
680:Dorsal
419:
368:
341:
287:Muscle
71:joints
965:Types
862:Parts
731:White
712:Ramus
695:Ramus
612:Glial
339:S2CID
233:brain
205:axons
888:Axon
870:Soma
726:Gray
707:Root
685:Root
417:ISBN
397:2018
366:ISBN
171:and
110:Type
1102:SVE
1097:GVE
1092:GSE
1037:SVA
1032:SSA
1027:GVA
1022:GSA
665:PNS
490:CNS
331:doi
191:of
138:In
135:N/A
1288::
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337:.
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101:.
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29:A
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749:)
740:(
474:e
467:t
460:v
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374:.
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333::
327:3
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