Primary projections of the trigeminal nerve in two species of sturgeon: Acipenser oxyrhynchus and Scaphirhynchus platorynchus.
Identifieur interne : 000819 ( Ncbi/Curation ); précédent : 000818; suivant : 000820Primary projections of the trigeminal nerve in two species of sturgeon: Acipenser oxyrhynchus and Scaphirhynchus platorynchus.
Auteurs : J G New ; R G NorthcuttSource :
- Journal of morphology [ 0362-2525 ] ; 1984.
English descriptors
- KwdEn :
- MESH :
- chemical : Horseradish Peroxidase.
- physiology : Efferent Pathways, Fishes, Trigeminal Nerve, Trigeminal Nuclei, Trigeminal Nucleus, Spinal.
- Animals, Mesencephalon, Synaptic Transmission.
Abstract
Horseradish peroxidase histochemical studies of afferent and efferent projections of the trigeminal nerve in two species of chondrostean fishes revealed medial, descending and ascending projections. Entering fibers of the trigeminal sensory root project medially to terminate in the medial trigeminal nucleus, located along the medial wall of the rostral medulla. Other entering sensory fibers turn caudally within the medulla, forming the trigeminal spinal tract, and terminate within the descending trigeminal nucleus. The descending trigeminal nucleus consists of dorsal (DTNd) and ventral (DTNv) components. Fibers of the trigeminal spinal tract descend through the lateral alar medulla and into the dorsolateral cervical spinal cord. Fibers exit the spinal tract throughout its length, projecting to the ventral descending trigeminal nucleus (DTNv) in the medulla and to the funicular nucleus at the obex. Retrograde transport of HRP through sensory root fibers also revealed an ascending bundle of fibers that constitutes the neurites of the mesencephalic trigeminal nucleus, cell bodies of which are located in the rostral optic tectum. Retrograde transport of HRP through motor root fibers labeled ipsilateral cells of the trigeminal motor nucleus, located in the rostral branchiomeric motor column.
DOI: 10.1002/jmor.1051820202
PubMed: 6096566
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