PubMed · 778645
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P E Voorhoeve. 1976-07-17. [Pain].. https://pubmed.ncbi.nlm.nih.gov/778645/
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Using an immunocytochemical method, the prenatal ontogeny of substance P-like immunoreactivity (SP-LI) was demonstrated in the parabrachial nucleus (PB) of human fetus, fetal age (menstruation age) 11.5 to 40 weeks. The time of initial appearance of SP-LI in the human brainstem PB was between fetal age 11.5 weeks and 16 weeks. While the fetus grew, the density of SP-LI fibers and terminals in the human fetus brainstem PB increased constantly from fetal age 16 weeks to 40 weeks. These findings indicate that substance P (SP) might play an important role in the human parabrachial nucleus development and in its functional establishment during the prenatal period.
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Using an immunocytochemical method, the prenatal ontogeny of substance P-like immunoreactivity (SP-LI) was demonstrated in the trigeminal spinal caudal subnucleus (TSCS) of human fetus, fetal age (menstruation age) 11.5-40 weeks. The time of initial appearance of SP-LI in the human brainstem TSCS was between the fetal age 11.5 weeks and 16 weeks. While the fetus grew, the density of SPLI fibers and terminals in the human fetus brainstem TSCS increased constantly from fetal age 16 weeks to 40 weeks. These findings indicated that substance P (SP) might play an important role in the human trigeminal nerve system development and in its functional establishment during the prenatal period.