title: [Physiological properties of A delta and C fibres of superficial branch of radial nerve in human].
abstract: By means of intraneural micro recording (INMR) and intraneural microstimulation (INMS), properties of receptive units innervated by A delta and C fibers of the superficial branch of the radial nerve were measured on humans. Thresholds of 24 A delta units to mechanical stimulation varied significantly; their receptive fields ranged from a single point to 75.4 mm2, with one to four receptive sensitive zones. A delta units by INMS evoked tingling with projected fields varying between 1.2 and 97 mm2. Receptive fields and projected fields of these units overlapped each other and showed a proximodistal size gradient (P < 0.05). The results suggest that A delta units have accurate localizing capacity. Eleven nociceptive units had higher threshold to mechanical stimulation. INMS of C nociceptive units evoked burning pain. Both the receptive fields and projected fields of most of these units showed overlapping indicating that C nociceptive units, to some extent, can localize noxious stimulation.
authors.affiliation: Department of Brain and Nerve, Xian Medical University.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: K M
authors.initials: KM
authors.lastname: Wang
authors.forename: D Y
authors.initials: DY
authors.lastname: Cao
authors.forename: L Z
authors.initials: LZ
authors.lastname: He
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009412:Nerve Fibers / Q000502:physiology; D009413:Nerve Fibers, Myelinated / Q000502:physiology; D009619:Nociceptors / Q000502:physiology; D017288:Pain Threshold / Q000502:physiology*; D010812:Physical Stimulation; D011826:Radial Nerve / Q000502:physiology*