Morphological characteristics of primary afferent neurons in feline mesencephalic trigeminal nucleus and trigeminal ganglion which innervate tooth pulps, as studied by retrogradely transported HRP.
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After 30% HRP in saline was applied to mandibular canine tooth pulps in 6 adult cats, the openings of the pulp chambers were sealed with dental glass-ionomer cement. Prednisolone sodium succinate was administered intramuscularly every 12 h. to prevent an acute inflammation in the pulp tissues after surgery. Following survivals of 3 days, the trigeminal ganglia on both sides and the brain stem were removed and cut into frozen sections of 60 μm thick. All sections were treated according to the histochemical protocol of Mesulam (1978) and examined microscopically under brightfield illumination. Many HRP-labeled neurons were found in both the mesencephalic trigeminal nucleus (MTN) and trigeminal ganglion (TG) on the side ipsilateral to the HRP application, but none were found either in MTN or in TG on the contralateral side. In TG, labeled neurons were localized in its posterolateral region. All the labeled MTN neurons were pseudounipolar, and distributed rostrocaudally from A3.5-P3.5 within MTN; approximately 70% of them were located in MTN regions from P1.5-P3.0. Frequency distributions of soma diameters of labeled neurons were unimodal both in MTN and TG. The distribution of labeled MTN neurons ranged from 21-58 μm with a mode around 38 μm, while that of labeled TG neurons ranged from 18-59 μm with a mode around 33 μm; difference in the two distributions was significant (X<SUP>2</SUP> test, p<0.01). The present results indicate that the cell bodies of feline tooth pulp afferents reside not only in TG, but also in MTN.
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