[Central localization of motor components in the internal branch of the superior laryngeal nerve: a horseradish peroxidase study in the rat].
The central organisation of the internal branch of the superior laryngeal nerve was examined in the rat using the technique of intraaxonal transport of horseradish peroxidase (HRP). Application of HRP to the internal branch resulted in anterograde labelling of afferent nerve fibres as well as in retrograde labelling of perikarya within both motor nuclei of the vagus, i.e. the nucleus ambiguus and the dorsal motor nucleus. The location of retrogradely labelled neurons is confined to an area of 700 microns length near the rostral extremities of both nuclei. The internal laryngeal branch, therefore, is not entirely sensory, but contains general and special visceral efferent fibres arising in the dorsal motor nucleus and in the nucleus ambiguus, respectively. Dorsal motor neurons of the internal branch represent preganglionic parasympathetic neurons projecting to the mucous glands of the larynx, whereas efferents from the nucleus ambiguus supply striated muscle fibres of the larynx. The arytenoid and aryepiglotticus are discussed as potential targets of the internal branch of the superior laryngeal nerve.
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D001933:Brain Stem / Q000033:anatomy & histology; D006735:Horseradish Peroxidase; D007821:Laryngeal Muscles / Q000294:innervation*; D007823:Laryngeal Nerves / Q000033:anatomy & histology*; D008297:Male; D009046:Motor Neurons / Q000648:ultrastructure*; D009132:Muscles / Q000294:innervation*; D009475:Neurons, Afferent / Q000648:ultrastructure; D009476:Neurons, Efferent / Q000648:ultrastructure; D051381:Rats; D011919:Rats, Inbred Strains; D014630:Vagus Nerve / Q000033:anatomy & histology
D006735:Horseradish Peroxidase
Zentrale Lokalisation motorischer Komponenten im Ramus internus des N. laryngeus superior: Eine HRP-Studie bei der Ratte.