title: Chronic extracellular recording of fetal medullary neuronal activity.
abstract: A technique for chronic extracellular recording of neuronal activity in the medullary region of fetal sheep during different sleep states is described. Of 51 recorded neurones, 54% were associated with respiration, blood pressure changes, or muscle electromyograms, and 46% were nonspecific. During apnea (nonrapid-eye-movement sleep) both inspiratory and expiratory neurons had random intermittent activity. Thus apnea is not associated with tonic expiratory neuronal activity.
mesh_terms: D000818:Animals; D004576:Electromyography; D005110:Extracellular Space / Q000502:physiology*; D005260:Female; D008526:Medulla Oblongata / Q000166:cytology / Q000196:embryology*; D008991:Monitoring, Physiologic; D009474:Neurons / Q000502:physiology*; D011247:Pregnancy; D012119:Respiration; D012756:Sheep / Q000196:embryology; D012890:Sleep / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D013997:Time Factors