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Receptive field properties of unmyelinated tactile afferents in the human skin.

Artikel i vetenskaplig tidskrift
Författare Johan Wessberg
Håkan Olausson
Katarina Wiklund Fernström
Åke Vallbo
Publicerad i Journal of neurophysiology
Volym 89
Nummer/häfte 3
Sidor 1567-75
ISSN 0022-3077
Publiceringsår 2003
Publicerad vid Institutionen för klinisk neurovetenskap, Sektionen för laborativ neurovetenskap
Institutionen för fysiologi och farmakologi, Avdelningen för fysiologi
Sidor 1567-75
Språk en
Länkar dx.doi.org/10.1152/jn.00256.2002
Ämnesord Adult, Female, Humans, Male, Mechanoreceptors, physiology, Nerve Fibers, Unmyelinated, physiology, Neurons, Afferent, physiology, ultrastructure, Physical Stimulation, Skin, innervation, Touch, physiology
Ämneskategorier Neurofysiologi

Sammanfattning

We recorded, with the microneurography technique, single-unit impulses from nine cutaneous mechanoreceptive afferents with conduction velocities in the C range and receptive fields in the hairy skin of the forearm. The units responded with high impulse rates to light touch and had low monofilament thresholds. The geography of receptive fields was explored with a scanning method: a lightweight probe with a small and rounded tip was made to scan the field area in a series of closely adjacent tracks while single-unit activity was recorded. The fields of the nine units varied considerably in size as well as complexity. The individual field consisted of one to nine small responsive spots distributed over an area of 1-35 mm(2) when explored with a moving indentation of 5 mN. The fields were roughly round or oval in shape with no preferred orientation. The size of the response differed between individual sensitive spots in a field, suggesting a highly nonuniform terminal organization. The properties of the fields seem consistent with a role of tactile C afferents to provide information about pleasant touch and skin-to-skin contacts to central structures controlling emotions and affiliative behavior.

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