细胞生理5的学习材料.pptxVIP

细胞生理5的学习材料第1页/共48页 Somatic senses Somatic senses receptors and its classification Somatosensory conducting pathwaysSection Outline1. Somatic senses and receptors of somatic senses第2页/共48页 1.1 Somatic sensationMechanical sensationThermal sensationChemical sensationElectromagnetic sensation第3页/共48页 Cutaneous sensationTouchPressureWarmthColdPain1.1 Somatic sensation第4页/共48页 Muller’s law: Each nerve fiber is activated primarily by a certain type of stimulus and each makes specific connections to structures in the central nervous system whose activity gives rise to specific sensations.1.1 Somatic sensation第5页/共48页 MechanoreceptorThermoreceptorNociceptor1.2 Receptors of somatic sensations and its classification第6页/共48页 MechanoreceptorAβ Adaptation: when a maintained stimulus of constant strength is applied to a receptor, the frequency of the action potentials in its sensory nerve declines over time.第7页/共48页 Receptive field: the receptive field of a sensory unit is the area from which a stimulus produces a response in that unit.Mechanoreceptor第8页/共48页 Warm receptor: C Cold receptor: AδThermoreceptor第9页/共48页 Nociceptor第10页/共48页 1.3 Somatosensory pathwaysConducting pathways of superficial sensationConducting pathways of deep sensationConducting pathways of craniofacial sensation第11页/共48页 第12页/共48页 第13页/共48页 Brown-Sequards syndrome第14页/共48页 2.Thalamus and its sensory projection systemRelay nucleus in the thalamusSensory projection systemSection Outline第15页/共48页 2.1 Relay nucleus in the thalamusSpecific sensory relay nucleusAssociated nucleusNonspecific thalamic nuclei第16页/共48页 第17页/共48页 2.2 Sensory projection systemSpecific projection systemNonspecific projection system第18页/共48页 Specific projection systemSpecific projection system:Characteristics: Project to specific discrete portions of the neocortex (point to point)Function: 第19页/共48页 第20页/共48页 Nonspecific projection systemNonspecific projection system:Characteristics: project diffusely to the whole neocortex (point to