A characterisation of spindle afferents from the intertransverse tail muscles in the rat.
The conduction velocities of myelinated afferent axons from the intersegmental muscles at the tail-base in rat range from 5.0--43.0 m-sec-1, and have a bimodal distribution with a boundary between the groups at 25.0 m-sec-1. Calculations of the dynamic indices of spindle endings, observed when stretching the muscle, show that axons from primary endings conduct at velocities above 28.0 m-sec-1 and those from secondary endings at below 24.0 m-sec-1. These characteristics resemble those of spindles in the rat hind-limb muscles, and do not compare with those in the more distally situated segmental tail muscles.
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D004558:Electric Stimulation; D008297:Male; D008465:Mechanoreceptors / Q000502:physiology*; D009132:Muscles / Q000294:innervation*; D009431:Neural Conduction; D009474:Neurons / Q000502:physiology*; D009475:Neurons, Afferent / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D013127:Spinal Nerves / Q000502:physiology; D013390:Succinylcholine / Q000494:pharmacology; D013623:Tail
D013390:Succinylcholine