歯根膜感覚入力を受けるネコ大脳皮質第一次体性感覚野ニューロンの反応と形態  [in Japanese] Response Properties and Morphology of Primary Somatosensory Cortical Neurons Receiving Input from the Periodontal Afferent in Cats  [in Japanese]

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Author(s)

    • 清水 信行 SHIMIZU Nobuyuki
    • 日本大学歯学部補綴学教室局部床義歯学講座 Department of Removable Partial Denture Prosthodontics, Nihon University School of Dentistry

Abstract

Single neuronal activities responded to low-threshold mechanical stimulation (stimulus intensity:<0.05 N) of the tooth (PDN) were intracellularly recorded from the primary somatosensory cortex (SI) in the cat anesthetized with α-chloralose and halothane. After identification of their response characteristics, neurobiotin was injected iontophoretically and morphological features of neurons were accurately analyzed.<BR>PDNs responded to low-threshold mechanical stimulation (<0.05 N) of the tooth and received dominantly periodontal afferent without input from other intraoral structures. Most of them received periodontal input from the ipsilateral side and showed directional selectivity to mechanical stimulation.<BR>Most PDNs intracellulary stained were classified as pyramidal neurons according to their morphological properties (13 Pyramidal and 1 non-pyramidal PDNs). Each pyramidal PDN had different morphological features. Mainly, axons of lamina III PDNs ran through relatively superficial regions of the subcortical white matter, whereas those of lamina V ran deep into the subcortical areas. The results suggested that lamina III pyramidal PDNs send periodontal sensory information to the other cortical regions and lamina V pyramidal PDNs send them to the far regions of the CNS such as the medulla and spinal cord.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 43(3), 538-550, 1999-06-10

    Japan Prosthodontic Society

References:  48

Codes

  • NII Article ID (NAID)
    10008173623
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03895386
  • Data Source
    CJP  J-STAGE 
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