Abstract
Evidence has been obtained for the existence of two separate events occurring in the human spinal cord following posterior tibial nerve (PTN) stimulation. These events can be recorded on the surface in unanesthetized individuals. The first is an ascending wave which is conducted up to the cord at constant velocity and has a relatively short refractory period consistent with a compound nerve action potential. This represents the afferent volley traversing the lumbosacral plexus and the ascending dorsal columns. A second event, the N22/P22 complex, is surface negative on the back and surface positive anteriorly: its amplitude is maximal 5-15 cm above the level of the L4 spine and its peak latency remains constant at all levels. This activity has a relatively long refractory period. These characteristics of N22/P22 indicate that it is a localized synaptically dependent event conforming to a transverse dipole with dorsal negativity and a simultaneous anterior positivity. The N22/P22 is probably generated in the dorsal grey at the root entry zone. The N22/P22 is analogous to the stationary N13/P13 recorded over the neck following median nerve stimulation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 323-331 |
| Number of pages | 9 |
| Journal | Electroencephalography and Clinical Neurophysiology/ Evoked Potentials |
| Volume | 62 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1985 |
Fingerprint
Keywords
- posterior tibial nerve
- posterior tibial SEP
- SEP
- spinal components
ASJC Scopus subject areas
- Clinical Neurology
- Neuroscience(all)
Cite this
The human posterior tibial somatosensory evoked potential : Synapse dependent and synapse independent spinal components. / Seyal, Masud; Gabor, Andrew J.
In: Electroencephalography and Clinical Neurophysiology/ Evoked Potentials, Vol. 62, No. 5, 1985, p. 323-331.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The human posterior tibial somatosensory evoked potential
T2 - Synapse dependent and synapse independent spinal components
AU - Seyal, Masud
AU - Gabor, Andrew J.
PY - 1985
Y1 - 1985
N2 - Evidence has been obtained for the existence of two separate events occurring in the human spinal cord following posterior tibial nerve (PTN) stimulation. These events can be recorded on the surface in unanesthetized individuals. The first is an ascending wave which is conducted up to the cord at constant velocity and has a relatively short refractory period consistent with a compound nerve action potential. This represents the afferent volley traversing the lumbosacral plexus and the ascending dorsal columns. A second event, the N22/P22 complex, is surface negative on the back and surface positive anteriorly: its amplitude is maximal 5-15 cm above the level of the L4 spine and its peak latency remains constant at all levels. This activity has a relatively long refractory period. These characteristics of N22/P22 indicate that it is a localized synaptically dependent event conforming to a transverse dipole with dorsal negativity and a simultaneous anterior positivity. The N22/P22 is probably generated in the dorsal grey at the root entry zone. The N22/P22 is analogous to the stationary N13/P13 recorded over the neck following median nerve stimulation.
AB - Evidence has been obtained for the existence of two separate events occurring in the human spinal cord following posterior tibial nerve (PTN) stimulation. These events can be recorded on the surface in unanesthetized individuals. The first is an ascending wave which is conducted up to the cord at constant velocity and has a relatively short refractory period consistent with a compound nerve action potential. This represents the afferent volley traversing the lumbosacral plexus and the ascending dorsal columns. A second event, the N22/P22 complex, is surface negative on the back and surface positive anteriorly: its amplitude is maximal 5-15 cm above the level of the L4 spine and its peak latency remains constant at all levels. This activity has a relatively long refractory period. These characteristics of N22/P22 indicate that it is a localized synaptically dependent event conforming to a transverse dipole with dorsal negativity and a simultaneous anterior positivity. The N22/P22 is probably generated in the dorsal grey at the root entry zone. The N22/P22 is analogous to the stationary N13/P13 recorded over the neck following median nerve stimulation.
KW - posterior tibial nerve
KW - posterior tibial SEP
KW - SEP
KW - spinal components
UR - http://www.scopus.com/inward/record.url?scp=0021924365&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021924365&partnerID=8YFLogxK
U2 - 10.1016/0168-5597(85)90040-1
DO - 10.1016/0168-5597(85)90040-1
M3 - Article
C2 - 2411513
AN - SCOPUS:0021924365
VL - 62
SP - 323
EP - 331
JO - Electroencephalography and Clinical Neurophysiology - Evoked Potentials
JF - Electroencephalography and Clinical Neurophysiology - Evoked Potentials
SN - 0168-5597
IS - 5
ER -