Depression of spinal monosynaptic reflex transmission by serotonergic agonists.
نویسندگان
چکیده
منابع مشابه
Transmission in Fractionated Monosynaptic Spinal Reflex Systems
A study has been made of conditions that support monosynaptic reflex transmission from afferent fibers of one part of a synergic muscle mass to motoneurons of another part. Heteronymous response so called can be brought on by prior tetanization of the afferent pathway and by asphyxiation to a critical stage. The response is facilitated by cooling and may appear in the cold preparation without n...
متن کاملReflex Depression in Rhythmically Active Monosynaptic Reflex Pathways
A study has been made of the depression that occurs when a monosynaptic reflex pathway is subjected to repetitive stimulation. Reflex depression has a dual origin. High frequency or early depression is postsynaptic in origin and results from subnormality in the motoneurons. Low frequency, late, or enduring depression is presynaptic in origin. The conditioning volley-test volley technique and th...
متن کاملMonosynaptic Reflex Response of Spinal Motoneurons to Graded Afferent Stimulation
Monosynaptic reflex response of spinal motoneurons to graded afferent volleys has been studied in natural populations and in a representative sample of individual motoneurons. By analysis of input-response relations certain of the requirements for initiation of reflex discharge have been defined. Initation of motoneuron discharge by monosynaptic afferent excitatory volleys results from the deve...
متن کاملLow-frequency depression of the monosynaptic reflex is not altered by tetrodotoxin-induced nerve conduction blockade.
The present study is part of ongoing investigations into activity-related synaptic plasticity in the intact animal. In this investigation we sought to determine whether the previously reported increase in synaptic efficacy at the Ia-motoneuron connection following nerve conduction blockade could be attributed to changes in circuitry external to the monosynaptic pathway. Specifically, we used th...
متن کاملMonosynaptic Reflex Responses of Individual Motoneurons
Individual motoneuron responses to a variety of afferent inputs have been examined. At a given input some motoneurons respond to every trial, some to no trial, and some respond to a certain percentage of trials that is characteristic for the motoneuron at that input. The performance of a motoneuron is expressed by means of a firing index that relates the number of responses to the number of tri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Japanese Journal of Pharmacology
سال: 1994
ISSN: 0021-5198
DOI: 10.1016/s0021-5198(19)50451-6