By D. Barker, C.C. Hunt, A.K. McIntyre
This part will ponder the constitution and serve as of muscle receptors, in addition to the relevant apprehensive process mechanisms with which they're involved. In quantity I of this guide, receptor mechanisms are mentioned intimately. additionally, the crustacean stretch receptor and the frog muscle spindle were thought of. the current part might be fascinated with vertebrate muscle receptors with an emphasis on mammals. Muscle receptors offer fascinating examples of specialised mechanorecep tors. The muscle spindle is a impressive case of a receptor that is regulated in its functionality via the vital worried procedure in efferent neurons. Muscle receptors have lengthy been identified to playa the most important position within the reflex rules of flow. in recent times it has develop into obvious that those receptors also are very important in sensory phenomena resembling the belief of place and circulate. St. Louis, July 1974 c.c. HUNT Contents bankruptcy I The Morphology of Muscle Receptors. by way of D. BARKER. With ninety nine Figures . . . . . . . . . . . . . . . .. 1 bankruptcy II The body structure of Muscle Receptors. through C.C. HUNT. With 21 Figures . . . . . . . . . . . . . . . . . 191 bankruptcy III important activities of Impulses in Muscle Afferent Fibres. through A. okay. McINTYRE. With eight Figures 235 writer Index 289 topic Index 299 checklist of participants BARKER, David division of Zoology, collage of Durham, technological know-how Laboratories, South street, Durham DH1 3LE, nice Britain HUNT, Carlton C. division of body structure and Biophysics, Washington collage, college of drugs, 660 South Euclid street, St. Louis, Mo. 63110, united states McINTYRE, A. K.
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MAYR (1970) has published micrographs showing one chain fibre encircled by an annulospiral terminal, and another supplied with a number of separate knob-like terminals, which are evidently part of a flower-spray configuration. Both types of terminal were connected to the same secondary afferent. 4 Hb. Sensory Physiology. Vol. III/2 50 D. BARKER: The Morphology of Muscle Receptors c) Free Endings. Free-ending axon terminals have been observed in association with all types of tissue in muscle except the capillary network (STACEY, 1969; see Fig.
Fibre-size histogram of the total diameters of cat tenuissimus spindle afferent fibres. 0 lim). Fibre diameters measured in teased, gold chloride preparations about 1 mm from the spindles (11 de-efferented, 91 normal). (From BOYD, 1962c) Secondary endings are located in the equatorial region on one or both sides of the primary ending (Plate 13, Fig. 56; Plate 14). In rare cases the endings on each side of the primary may be supplied by the same afferent (BARKER, 1948; JONES, 1966). In most cat and rabbit hindlimb muscles the usual condition is for there to be one secondary ending lying adjacent to the primary (RUFFINI'S (1898) intermediate type of spindle) .
2% in a similar sample from soleus. In order to account for the high frequency of the PI innervation in FHL it is necessary to assume that both fast and slow conducting p fibres are involved in the supply. 56 D. BARKER: The Morphology of Muscle Receptors This would mean that the spindles are associated with both slow and fast contracting motor units composed of type B and type C muscle fibres, respectively (see Discussion in BARKER, STACEY and ADAL). ANDREW and PART (1973) have in fact recently found such an association to obtain in the p-innervated spindles in rat segmental tail muscles.
Muscle Receptors by D. Barker, C.C. Hunt, A.K. McIntyre