Naslov
Functional organisation of the facial motor system in man

Autori
Liščić, Rajka M. ; Zidar, Janez

Izvornik
Collegium antropologicum (0350-6134) 22 (1998), 2; 545-550

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
magnetic stimulation; unit responses; muscles; organization; projections; motoneurons; pathways; brain

Sažetak
To investigate human corticobulbar projections, electromyographic responses from orbicularis oculi and orbicularis oris muscles were recorde in the healthy subjects after transcranial magnetic stimulation. Selective activation of lower facial motoneurones of one hemisphere was reached with the round coil 4 cm lateral to the vertex on, a line to the external auditory meatus with stimulus intensities from 45 to 55% (100%=1.5 T). the mean latency of the OR muscle was 11.5+1.77 ms contralaterally. Ipsilateral cortical responses were observed in 5 subjects (45%) at a mean latency of 13.88+2.17 ms. Corticobulbar innervation may have affected bilateral responses in the lower facial muscles as those persisted even after lidocaine blockade of both supraorbital nerves. the functional importance of ipssilateral projections to the lower facial muscles in man is lower than that of the contralateral projections, as evidenced by the fact that they cannot be observed in all subjects or in all motor units. the influence of the trigeminal sensory afferents was excluded from the study after blockade of both supraorbital nerves.

Izvorni jezik
Engleski

Znanstvena područja
Kliničke medicinske znanosti

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