Motor fibres innervating extrafusal and intrafusal muscle fibres in the cat.

Regeneration of afferent and efferent fibres to muscle spindles after nerve injury in adults cats.

“…There is evidence (e.g. Bessou et al 1965;Brown, Crowe & Matthews, 1965) that y dynamic fibres and /3 dynamic fibres can successfully innervate the same spindle. It seems possible then that the extra /3 motor innervation provided to the spindles as a result of reinnervation will persist even if the y fibres eventually return to the spindles as well.…”

“…The view that in normal cats ,3 fibres were a sporadic or accidental finding (Bessou et al 1965) has recently changed. Both McWilliam (1975) and Emonet-Denand, Jami & Laporte (1975) now regularly find dynamic ,3 fibres in various cat hind-limb muscles and they are probably present in all.…”

A brief historical note on the classification of nerve fibers

“…The observations that extrafusal muscle fibers were innervated by fibers conducting in the alpha range led to the designations of α and γ motoneurons 14 . Following physiological and anatomical evidence, of the existence of some motoneurons innervating intra and extrafusal muscle fibers [15][16][17] and the recognition that these motoneurons had axons conducting in the lower α range (and apparently following a suggestion of lapporte) 17 ,these motoneurons are referred to as β motoneurons 18,19 .…”

Proceedings of the Physiological Society, 18–19 January 1974, St.Thomas's Hospital Meeting: Communications

“…and tenuissimus muscles were isolated in single fibre spinal root filaments. ft innervation was sought for using the criteria laid down by Bessou et al (1965) and the results are shown in Table 1.…”