Synaptic connections of a low-threshold mechanoreceptive primary neuron within the trigeminal subnucleus oralis.
The central axon of a primary afferent neuron that responded to indentation of the glabrous skin of the lower lip in a slowly adapting fashion was intra-axonally injected with horseradish peroxidase. The labeled terminal within the subnucleus oralis was examined electron microscopically. The labeled ending had a pale axoplasm and contained clear spherical synaptic vesicles. The labeled ending formed a synaptic triad with a dendrite and an unlabeled axonal ending with pleomorphic vesicles (a mixture of oval, flattened and dense core vesicles). The labeled primary ending was presynaptic only to the dendrite, while the unlabeled ending was presynaptic to both the dendrite and the labeled primary ending.
Sugimoto
T
T
Second Department of Oral Anatomy, Osaka University Faculty of Dentistry, Japan.
Nagase
Y
Y
Nishiguchi
T
T
Kitamura
S
S
Shigenaga
Y
Y
D000818:Animals; D001370:Axonal Transport; D001369:Axons / Q000502:physiology / Q000648:ultrastructure; D002415:Cats; D004525:Efferent Pathways / Q000033:anatomy & histology / Q000502:physiology; D006735:Horseradish Peroxidase; D008046:Lip / Q000294:innervation; D008297:Male; D008465:Mechanoreceptors / Q000502:physiology*; D008854:Microscopy, Electron; D009474:Neurons / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D013569:Synapses / Q000502:physiology* / Q000648:ultrastructure; D014278:Trigeminal Nuclei / Q000033:anatomy & histology / Q000502:physiology*
D006735:Horseradish Peroxidase