Initiation of Nerve Impulses Inthe Frog Muscle Spindle

Ito, Fumio

doi:10.2170/jjphysiol.19.733

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…9 B). This deflexion suggests that the impulse may initiate at a node in the gap (for example, NO or Ni); such initiation has been discussed in a previous paper (Ito, 1969b). After transaction of Bs, spontaneous discharges of propagated and abortive spikes appeared unchanged in each of four preparations maintained at 100% spindle length.…”

Section: Asymmetries Of Spindle Terminal 401mentioning

confidence: 56%

Structural and functional asymmetries of myelinated branches in the frog muscle spindle

Ito¹,

Kanamori²,

Kuroda³

1974

The Journal of Physiology

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Section: Asymmetries Of Spindle Terminal 401mentioning

confidence: 56%

Structural and functional asymmetries of myelinated branches in the frog muscle spindle

Ito¹,

Kanamori²,

Kuroda³

1974

The Journal of Physiology

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“…Ito (1969) has suggested the possibility of analysing changes in the shape of individual action potentials discharged at the maximum rate during strong stretches as an approach towards resolving this question.…”

Section: Discussionmentioning

confidence: 99%

“…The possibility of sensory impulses arising at the second or more proximal nodes of Ranvier may be considered when the muscle spindle is stretched more strongly. Ito (1969) has suggested the possibility of analysing changes in the shape of individual action potentials discharged at the maximum rate during strong stretches as an approach towards resolving this question.…”

Section: Discussionmentioning

confidence: 99%

“…This supposition has been indirectly supported by changes in the shape of action potentials during stretch of the muscle spindle (cf. Ito, 1969), but direct evidence about displacement of the impulse initiation site from the non-myelinated terminal to the first or more proximal nodes by increasing the stimulus strength in normal condition, remained unestablished.…”

Section: Introductionmentioning

confidence: 93%

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Frog muscle spindles with unbranched myelinated afferent axons: the response to stretch and the length of the first myelinated segment.

Ito¹,

Komatsu²

1977

The Journal of Physiology

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SUMMARY1. Twenty-five muscle spindles innervated by unbranched myelinated axons in the capsule were isolated from sartorius muscles in young frogs (2.2-9.5 g in weight, 28-47 mm in rostro-caudal length).2. The lengths and the diameters of the first myelinated segments varied from 30 to 170 ,m and from 9 to 20 ,m respectively. There was no relationship between the lengths and the diameters.3. Dynamic and static components were analysed from discharge rates of the muscle spindles during ramp-and-hold stretches of 0-8 mm from different initial lengths. The values of the dynamic components to a certain stretch stimulation increased with shortening in the length of the first myelinated segment. The values of the static components were independent in length.4. The amplitudes of action potentials recorded from the spindle terminal decreased during the dynamic phase of the stretch. The ratio of amplitude decrease at the end of the dynamic phase versus the initial length depended upon the length of the first myelinated segment.5. These results suggest that the discharges during stretch may arise at the first node, though the spontaneous discharges may be generated at the terminal.

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“…On the other hand, the amplitude of the notch (N) was independent of the distance in the range between 1 and 10mm. In an earlier report (ITO, 1969b), such a notch in conductive spikes was ascribed to a potential deflection induced at the boundary of the external longitudinal resistance along the axon between the paraffin pool and the Ringer's pool perfusing the proximal nerve trunk, i.e., at the secondary boundary along the direction of impulse conduction. This is in sharp contrast to the I peak initiated at the primary boundary.…”

Section: Steady Potentialmentioning

confidence: 92%

Responses in the Sensory Nerve Terminal of Leaf-Like Receptors in the Frog Sartorius Muscle

Ito

1971

Jpn.J.Physiol

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1. Electrical responses of isolated leaf-like receptors in the frog sartorius muscle to muscle stretch were recorded by means of the paraffin gap method. 2. The sensory terminal is always positive by 0.25 to 1mV to the proximal portion of the axon. The magnitude of the steady potential decreases with increase in the terminal-gap distance. Crushing of the axon, especially under the paraffin pool, yields large changes of the steady potential.

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Initiation of Nerve Impulses Inthe Frog Muscle Spindle

Cited by 9 publications

References 10 publications

Structural and functional asymmetries of myelinated branches in the frog muscle spindle

Structural and functional asymmetries of myelinated branches in the frog muscle spindle

Frog muscle spindles with unbranched myelinated afferent axons: the response to stretch and the length of the first myelinated segment.

Responses in the Sensory Nerve Terminal of Leaf-Like Receptors in the Frog Sartorius Muscle

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