![]() Reflex and cerebellar influences on alpha and on 'rhythmic' and 'tonic' gamma activity in the intercostal muscle. PROPRIOCEPTIVE INNERVATION OF THE DIAPHRAGM. CORDA M, EKLUND G, VON EULER EXTERNAL INTERCOSTAL AND PHRENIC ALPHA-MOTOR RESPONSES TO CHANGES IN RESPIRATORY LOAD.The innervation of mammalian neuromuscular spindles. The response to vibration of the end organs of mammalian muscle spindles. Links to PubMed are also available for Selected References. Get a printable copy (PDF file) of the complete article (1.8M), or click on a page image below to browse page by page. Full textįull text is available as a scanned copy of the original print version. The results indicate that both `dynamic' and `static' γ fibres are represented among the rhythmic γ fibres controlling primary muscle spindle endings, whereas rhythmic activation of secondary endings seems to be mediated only by `static' fibres. Fifty-seven spindle endings which all showed marked rhythmic inspiratory γ activation were tested for respiratory variations in their dynamic responses to steady stretch and length changes introduced at low repetition rates.Ĩ. The majority of the secondary endings (74%) showed inspiratory rhythmic fusimotor activation in parallel with the skeletomotor contraction as did the primary endings (79%).ħ. Both `tonic' and `phasic' properties were found among the primary (high- f sensitive) endings.Ħ. All the secondary (low- f sensitive) endings were `tonic' except three for which the determination of critical frequency was questionable. whether `phasic' or `tonic' (Granit & Van Der Meulen, 1962) was studied in all the spindle afferents.ĥ. The manner in which the spindle endings resumed activity after a pause produced by shocks to the ventral root, i.e. The latter were regarded as primary endings and the former as secondary ones.Ĥ. The endings fell into two groups: low- f (frequency) sensitive endings with critical frequencies below 400 c/s and high- f sensitive endings with critical frequencies above 400 c/s. The maximal frequency which they were able to follow regularly for at least four cycles, termed `critical frequency', was determined.ģ. In order to assignate the afferents to either primary or secondary endings they were tested for their responsiveness to vibration (Bianconi & Van Der Meulen, 1963). In cats anaesthetized with sodium pentobarbital 160 external intercostal muscle spindle afferents were identified by their pause in response to ventral root stimulation the internal intercostal muscle was denervated.Ģ.
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