Linked Life Data

2388162

Source:http://linkedlifedata.com/resource/pubmed/id/2388162

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1990-9-27
pubmed:abstractText
1. Ia projections and recurrent inhibition from quadriceps to tibialis anterior and soleus motoneurones were investigated in man. 2. Changes in the firing probability of individual voluntarily activated motor units were studied following electrical stimulation of the femoral nerve or quadriceps tendon tap. 3. Femoral nerve stimulation evoked an early increase in the firing probability of tibialis anterior units. This excitation was also evoked by a tendon tap, had a low threshold and its central delay was estimated to be the same as that of the homonymous monosynaptic Ia excitation. These findings strongly suggest that the femoral nerve-induced excitation is Ia in origin and mediated through a monosynaptic pathway. 4. The frequency of heteronymous Ia excitation from quadriceps was about the same to both ankle flexor and extensor units (79 and 70% respectively). 5. In 80% of both tibialis anterior and soleus units the Ia excitation was followed by a decrease in firing probability. This inhibition had a short latency and a long duration (up to 40 ms); it always appeared with the quadriceps reflex discharge and increased with it. These findings suggest that this decrease in firing probability is due to the Renshaw inhibition evoked by the quadriceps motoneurone discharge. 6. Both the Ia excitation and the following inhibition of tibialis anterior and soleus units were also observed when the stimulation was applied to the nerve of the vastus lateralis (a pure knee extensor). 7. The functional significance of these identical projections from quadriceps to both ankle flexor and extensor motoneurones is discussed with regard to the requirements of bipedal stance and gait.
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-13439582, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-13611693, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-14418911, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-3681741, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-3795085, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-421149, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-5090988, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-536912, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-6090196, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-6146138, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-6492004, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-7238674, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-925987, http://linkedlifedata.com/resource/pubmed/commentcorrection/2388162-958492
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0022-3751
pubmed:author
pubmed:issnType
Print
pubmed:volume
423
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
661-75
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Monosynaptic Ia excitation and recurrent inhibition from quadriceps to ankle flexors and extensors in man.
pubmed:affiliation
Hôpital de la Salpêtrière, Paris, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't