The direct projections from the nucleus tractus solitarius (NTS) and area postrema (AP) to the periaqueductal gray (PAG) were investigated in the rat by using tract-tracing techniques.
应用神经束路追踪技术对大鼠孤束核（NTS）和最后区（AP）向中脑导水管周围灰质（PAG）的直接投射进行了观察。
BACKGROUND:The nucleus tractus solitarius(NTS) is one of the key relay stations of various visceral primary afferent information.
背景：脑干孤束核是内脏痛信息向高位脑中枢传递的一个关键的中继站。
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