This study was carried out to determine the presence or absence of vasomotor fibers to the upper extremity in the anterior roots of the upper thoracic and lower cervical roots of man, and to investigate the role of the posterior roots in maintaining vasomotor tone.
Vasoconstriction or vasodilatation may occur in the digits of an extremity following electrical or mechanical stimulation of spinal roots. The digital plethysmograph is especially adaptable to detecting and recording such vasomotor responses.
Plethysmographic recordings were obtained from two digits of the upper extremity of patients during the performance of thoracic anterolateral chordotomy. The operative area was extended to permit stimulation of the upper thoracic and lower cervical posterior and anterior roots.
BRIDGES TJ, YAHR MD. Digital Vasomotor Responses Following Nerve Root Stimulation. AMA Arch NeurPsych. 1955;74(5):534–543. doi:https://doi.org/10.1001/archneurpsyc.1955.02330170068012
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