Brain, Vol 120, Issue 2 245-255, Copyright © 1997 by Oxford University Press
ML Thompson, GW Thickbroom and FL Mastaglia
The topography of the cortical motor projection to the sternocleidomastoid
(SCM) muscles was investigated in 15 normal subjects using the technique of
transcranial magnetic stimulation. Contrary to the long-held view that the
representation of the neck muscles in the motor strip is close to that of
the face, our findings indicate that the projection to both the ipsilateral
and contralateral SCM muscles arises from an area of cortex high up on the
cerebral convexity close to the trunk representation and at a comparable
level to the sensory representation of the neck in the post-central cortex.
The use of shielded intramuscular recordings showed that surface recordings
detect activity not only from the SCM muscle but also from the overlying
platysma muscle whose cortical representation is lateral to that of the
hand muscles. Our findings confirm that the corticomotor projection to the
SCM muscle follows both a contralateral monosynaptic pathway, and an
ipsilateral pathway, and indicate that the latter pathway may be
disynaptic.
ARTICLES
Corticomotor representation of the sternocleidomastoid muscle
Australian Neuromuscular Research Institute, Queen Elizabeth II Medical Centre, Nedlands, WA, Australia.
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