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Bulbar neurones with axonal projections to the trigeminal motor nucleus in the cat

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Summary

The location of bulbar neurones with axons projecting to the ipsi- and contralateral trigeminal motor nucleus were investigated in cats anaesthetized with sodium pentobarbital. Wheat germ agglutinin-conjugated horseradish peroxidase (WGA-HRP) was injected in amounts of 5–24 nl. A volume-calibrated microelectrode was used for recording of evoked potentials and pressure injection of WGA-HRP. The injection site was guided by the position where a maximal antidromic response was evoked by electrical stimulation of the masseteric nerve. The survival time was 19–22 h. In preparations with the depot located in the masseteric subnucleus retrogradely stained neurones were found bilaterally in the borderzone of the trigeminal motor nucleus. Dense populations of stained neurones were observed ipsi- and contralaterally in the dorsal division of the main sensory trigeminal nucleus and the subnucleus-γ of the oral nucleus of the spinal trigeminal tract. Clusters of WGA-HRP-neurones were observed bilaterally in the lateral tegmental field at the level of the subnucleus-β of the oral nucleus of the spinal trigeminal tract, bilaterally dorsal to the facial nucleus and contralaterally adjacent to the hypoglossal nucleus. No stained neurones were found in the gigantocellular reticular nucleus. A group of stained neurones was located in the marginal nucleus of brachium conjunctivum and some were found in the raphé nuclei near obex. Cell profiles were of two types: medium-sized neurones with a triangular profile and 30–40 μm diameter, and fusiform neurones 10×50–70 μm. Convergence of descending cortical and trigeminal afferent inputs on interneurones located in the lateral borderzone of the trigeminal motor nucleus, i.e. the intertrigeminal area, is reported in the preceding paper.

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Abbreviations

BCM:

Marginal nucleus of the brachium conjunctivum

CAE:

Nucleus caeruleus

CI:

Inferior central nucleus

Cu:

Cuneate nucleus

Cux:

External cuneate nucleus

DMV:

Dorsal motor nucleus of the vagus

FTG:

Gigantocellular tegmental field

FTL:

Lateral tegmental field

FTP:

Paralemniscal tegmental field

Gr:

Gracile nucleus

Mb:

Medial borderzone of NVmt

NintV:

Intertrigeminal area

NsV:

Supratrigeminal nucleus (area)

NVmes:

Mesencephalic trigeminal nucleus

NVmt:

Trigeminal motor nucleus

NVsnpr:

Main sensory trigeminal nucleus

NVsnpr-d:

Main sensory trigeminal nucleus, dorsal division

NVsnpr-v:

Main sensory trigeminal nucleus, ventral division

NVspc:

Caudal nucleus of the spinal trigeminal tract

NVspo-γ:

Subnucleus-γ of the oral nucleus of the spinal trigeminal tract

NVspo-β:

Subnucleus-β of the oral nucleus of the spinal trigeminal tract

NVspo-α:

Subnucleus-α of the oral nucleus of the spinal trigeminal tract

V:

Spinal trigeminal tract

NVII:

Facial nucleus

VII:

Facial nerve

NXII:

Hypoglossal nucleus

XII:

Hypoglossal nerve

Ols:

Superior olive

Rb:

Rostral borderzone of NVmt

Vb:

Ventral borderzone of NVmt

VIN:

Inferior vestibular nucleus

VSL:

Superior vestibular nucleus, lateral division

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Authors and Affiliations

  1. Departments of Physiology, University of Umeå, S-901 87, Umeå, Sweden

    S. Landgren

  2. Departments of Prosthetic Dentistry, University of Umeå, S-901 87, Umeå, Sweden

    K. Å. Olsson

  3. Departments of Endodontics, University of Umeå, S-901 87, Umeå, Sweden

    K. G. Westberg

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  1. S. Landgren
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  2. K. Å. Olsson
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  3. K. G. Westberg
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Landgren, S., Olsson, K.Å. & Westberg, K.G. Bulbar neurones with axonal projections to the trigeminal motor nucleus in the cat. Exp Brain Res 65, 98–111 (1986). https://doi.org/10.1007/BF00243833

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  • DOI: https://doi.org/10.1007/BF00243833

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