Abstract:
:Vocalization can be elicited by stimulation in the periaqueductal gray (PAG). Light-microscopical tracing and physiological studies have revealed that the PAG uses the nucleus retroambiguus (NRA) as a relay to excite the vocalization muscle motoneurons. Direct NRA projections have been demonstrated to pharyngeal and abdominal wall muscle motoneurons, but not to laryngeal motoneurons. In two cats 0.1% cholera toxin subunit b was injected in the cricothyroid muscle of the larynx to retrogradely label its motoneurons, and 2.5% wheat germ agglutinin-horseradish peroxidase was injected into the NRA to anterogradely label its fibers. The electronmicroscopical results indicate that the NRA fibers make monosynaptic contacts with cricothyroid motoneuronal dendrites. Almost all NRA terminal profiles had asymmetrical synapses and contained mostly round or pleiomorphic vesicles, which strongly suggests that the NRA-cricothyroid motoneuronal projection is an excitatory pathway.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Boers J,Klop EM,Hulshoff AC,de Weerd H,Holstege Gdoi
10.1016/s0304-3940(01)02395-3keywords:
subject
Has Abstractpub_date
2002-02-08 00:00:00pages
5-8issue
1eissn
0304-3940issn
1872-7972pii
S0304394001023953journal_volume
319pub_type
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