E J Múñoz-Martínez

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A method to measure small movements of living tissues either large or small is presented. The method is based on the detection of changes in reflected infrared light. An optocoupler (coupled photodiode and photodetector) and a small (< 1 cm2) mirror were used. The optocoupler (OC) has a low cost and it can be calibrated easily. It can be also used as the(More)
Some afferent fibers from the pudendal nerve of the female cat were stimulated by pressing on the perineal skin, the vagina or the uterine cervix. Three different types of skin mechanoreceptors were found: (1) with low threshold (< 20 mg) and slow-adapting discharges; (2) with high threshold (0.1-0.5 g) and slow-adapting discharges; and (3) with low(More)
Crude homogenate of the seed of the tullidora (Coyotillo, buckthorn; Karwinskia humboldtiana) fruit or a purified neurotoxin extracted from it was administered orally to male Wistar rats. Three to 5 weeks later, gait disturbances and progressive flaccid paralysis of the hindlimbs appeared in these animals which were then submitted to acute experiments.(More)
The question of whether skin receptors might help in the perception of muscle contraction and body movement has not been settled. The present study gives direct evidence of skin receptor firing in close coincidence with the contraction of the vaginal and anal sphincters. The distal stump of the sectioned motor pudendal nerve was stimulated. Single shocks(More)
The sensory pudendal nerve (SPN) was stimulated in decerebrate female cats. Spikes of single Ia muscle spindle afferents from the medial gastrocnemius (MG) muscle were recorded in dorsal root filaments. Electroneurography (ENG) was recorded in a cut nerve filament to the MG muscle; MG electromyography (EMG) was also recorded. Single shock to SPN induced(More)
In urethane-anesthetized rats, the compound action potential of the pelvic nerve was found to consist of three different waves, two in the A delta fiber and one in the C-fiber range of conduction velocity. Electrical stimulation of the pelvic nerve produced a complete inhibition of the withdrawal response to noxious foot pinch or foot compression. The(More)
In decerebrate cats, controlled mechanical stimulation of the perivulvar skin, the vaginal wall or the cervix uteri induced visible hind limb extension. Pressing on the cervix uteri produced the greater response. To quantify these responses, the EMG activity and the tension developed by the normally inserted triceps surae muscles were recorded. The activity(More)
In sympathetic neurons, axotomy induces a marked depression in synaptic transmission. We asked whether the decrease in synaptic efficacy observed in a given axotomized cell is more severe if most of the postsynaptic neurons are also injured. Accordingly, we studied if the synaptic depression induced by axotomy in neurons with axons running in a(More)
In decerebrate or spinal cats, sustained mechanical stimulation of the cervix uteri inhibited the flexor reflex elicited by electrical stimulation of the foot pad during the probing period (160 s). After probing, 3-15 min were required for reflex recovery. No additional inhibition was produced if probing was repeated before recovery, but instead the reflex(More)