Spinal commissural neurons mediating vestibular input to neck motoneurons in the cat upper cervical spinal cord.
Spinal commissural neurons (CNs) activated di- or trisynaptically by stimulation of ipsilateral vestibular afferents were stained with intraaxonal injection of horseradish peroxidase in the cat upper cervical spinal cord. Stem axons of CNs in lamina VIII or VII, after crossing the midline, had ascending and/or descending main branches that gave off multiple axon collaterals to laminae IX and VIII over a few cervical segments. Terminal boutons appeared to make contact with proximal dendrites and somata of retrogradely-labelled neck motoneurons. Therefore, these CNs were regarded as mediating vestibular afferent input to contralateral neck motoneurons trisynaptically at the shortest.
Sugiuchi
Y
Y
Department of Otolaryngology and Physiology, School of Medicine, Tokyo Medical and Dental University, Japan.
Kakei
S
S
Shinoda
Y
Y
D000818:Animals; D001369:Axons / Q000502:physiology; D002415:Cats; D006651:Histocytochemistry; D006735:Horseradish Peroxidase; D009046:Motor Neurons / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology; D013116:Spinal Cord / Q000166:cytology / Q000502:physiology*; D014722:Vestibule, Labyrinth / Q000166:cytology / Q000502:physiology*
D006735:Horseradish Peroxidase