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In the present report, we provide evidence that mesencephalic trigeminal (Mes-V) sensory neurons, a peculiar type of primary afferent cell with its cell body located within the CNS, may operate in different functional modes depending on the degree of their membrane polarization. Using intracellular recording techniques in the slice preparation of the adult(More)
Trigeminal motoneurons of the guinea pig brain stem slice preparation were studied using intracellular recording techniques. The voltage response to a 100-ms constant-current pulse was studied and a population of cells was found which did not exhibit sag or overshoot of their voltage response to a pulse of hyperpolarizing current of < 1 nA but did exhibit(More)
The objective of this research was to compare the length of muscle spindles to the length of the whole muscle, during normal movements. Pairs of piezoelectric crystals were implanted near the origin and insertion of muscle fibres in the medial gastrocnemius (MG) muscle of cats. The distance between crystals was measured with pulsed ultrasound, the(More)
We have proposed that neurotrophins, in addition to their trophic actions, act as neuromodulators in the adult central nervous system. As a first step to test this hypothesis, we examined in the adult rat slice preparation whether nerve growth factor and neurotrophin-3 are capable of altering the excitability of neurons of the mesencencephalic trigeminal(More)
The lengths and pinnation angles of muscle fibers in the medial gastrocnemius (MG) muscle have recently been measured in freely moving cats [Hoffer et al., Progr. Brain Res. 80, 75-85 (1989); Muscle Afferents and Spinal Control of Movement (1992)] using an ultrasound transit-time (USTT) technique. This method assumed that the velocity of ultrasound through(More)
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