Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

On organization of a neur… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

On organization of a neuronal network in pathways from group II muscle afferents in feline lumbar spinal segments.

Artikel i vetenskaplig tidskrift
Författare Elzbieta Jankowska
U Slawinska
Ingela Hammar
Publicerad i The Journal of physiology
Volym 542
Nummer/häfte Pt 1
Sidor 301-14
ISSN 0022-3751
Publiceringsår 2002
Publicerad vid Institutionen för fysiologi och farmakologi
Sidor 301-14
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Animals, Cats, Electric Stimulation, Interneurons, physiology, Membrane Potentials, physiology, Muscle, Skeletal, innervation, Nerve Net, physiology, Neural Pathways, physiology, Neurons, Afferent, physiology, Receptors, Presynaptic, physiology, Synapses, physiology
Ämneskategorier Neurofysiologi

Sammanfattning

The aim of the study was to verify the hypothesis that trisynaptic actions of group II muscle afferents upon motoneurones are, at least in part, mediated by dorsal horn interneurones exciting the same intermediate zone interneurones that are interposed in disynaptic pathways from group II afferents. Population EPSPs (field potentials) and responses of individual interneurones evoked by group II afferents in the dorsal horn and in the intermediate zone were analysed in order to assess the possibility of a causal relationship between them. When direct actions of group II afferents in the intermediate zone were abolished by presynaptic inhibition, distinct later components of field potentials and delayed interneuronal responses were induced at latencies 0.5-1 ms longer than those seen originally. Both the latency and a marked temporal facilitation define these later group II actions as being evoked disynaptically. Under the same conditions, single stimuli activated more than one half of dorsal horn interneurones, and the second and third stimuli activated all of these interneurones. Responses of dorsal horn interneurones preceded disynaptically evoked responses of intermediate zone interneurones. The study indicates that intermediate zone interneurones may be activated by group II afferents both directly and via dorsal horn interneurones and that synaptic actions of group II afferents upon these interneurones, and their subsequent actions upon motoneurones, may be modulated in parallel at the level of intermediate zone and dorsal horn interneurones.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?