https://docplayer.pl/6509315-Dwa-piony-dowodzenia-ruchem-osi...

Wrzeciono mięśniowe
–
część układu regulującego
długość mięśnia
Włókna intrafuzalne typu: „nuclear bag” i „nuclear
chain”
•
Włókna aferentne
(„pierwotne”) Ia mają
początek w obu typach
włókien mięśniowych
•
Mniejsze tzw. wtórne aferenty
typu II odchodzą tylko z
włókien typu „nuclear chain”
•
Oba typy aferentów (Ia i II) z
włókien „łańcuchowych”
wykazuja impulsację
proporcjonalną do długości
mięśnia

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Note added at 3 hrs (2022-09-27 10:02:21 GMT)
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Unmyelinated type II afferent neurons report cochlear damage
https://www.ncbi.nlm.nih.gov › articles › PMC4664349
by C Liu · 2015 · Cited by 94 — Despite this extensive arbor, ****type II afferents**** are weakly activated by outer hair cell transmitter release and are insensitive to sound.

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Note added at 3 hrs (2022-09-27 10:03:15 GMT)
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Type Ia sensory fiber - Psychology Wiki - Fandom
https://psychology.fandom.com › wiki › Type_Ia_sens...
****Type Ia Sensory Fiber also called Primary Afferent Type 1A Fiber*** is a neuron component of the peripheral sensory system which innervates the muscle spindles ...

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Note added at 3 hrs (2022-09-27 10:08:18 GMT)
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https://nba.uth.tmc.edu/neuroscience/m/s3/chapter01.html

1.10 Sensory Innervation of Muscle Spindles

Because the muscle spindle is located in parallel with the extrafusal fibers, it will stretch along with the muscle. The muscle spindle signals muscle length and velocity to the CNS through two types of specialized sensory fibers that innervate the intrafusal fibers. These sensory fibers have stretch receptors that open and close as a function of the length of the intrafusal fiber.

Group Ia afferents (also called primary afferents) wrap around the central portion of all 3 types of intrafusal fibers; these specialized endings are called annulospiral endings. Because they innervate all 3 types of intrafusal fibers, Group Ia afferents provide information about both length and velocity.

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Note added at 3 hrs (2022-09-27 10:08:37 GMT)
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I am unable to find anything with "loop", FWIW.


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Note added at 5 hrs (2022-09-27 11:54:33 GMT)
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found it!


Basic Nerve Conduction Studies - AANEM
https://www.aanem.org › getmedia › Regional-Me...
PDF
Muscle fibers. Motor Neuron ... Sensory NCS should record only sensory fibers ... *****Afferent loop: Ia sensory fibers**** Efferent loop: Motor axons.

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Note added at 5 hrs (2022-09-27 11:58:21 GMT)
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please check last site, I didn't have a careful look at it:)