Innervation of the cat lip by two groups of parasympathetic vasodilator fibres.
Innervation of the cat lip by two groups of parasympathetic vasodilator fibres.
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猫唇部由两组副交感血管舒张纤维支配。
DOI：
10.1113/jphysiol.1993.sp019690
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
K. Karita
中科院分区：
文献类型：
--
作者：
H. Izumi;K. Karita
1.在麻醉猫中，鼓索神经固有（CTNP）和舌索神经（CLN）的外周切断端的电刺激以刺激强度依赖性方式引起同侧下唇、舌和颌下腺的血流量增加。2.用六甲铵（1.0 mg kg-1，i. v.）预处理，一种自主神经节阻滞剂，显著降低了CTNP诱导的上述三个部位的血流量增加以及CLN诱导的下唇血流量，但对CLN诱导的舌和下颌下腺血流量增加没有影响。3. CTNP刺激诱导的下唇血流量不受舌神经适当部分的影响，但通过切断CLN或下颌管中的下牙槽神经（IAN）而消除。4.唇血流量增加引起反射性电刺激上牙龈，中央切断端的下颌舌骨神经和CLN的CTNP的切割没有受到影响，但显着减少预处理与六甲铵和废除的一节的下牙槽神经只是远侧下颌舌骨神经。这些观察结果表明，副交感神经血管扩张纤维参与三叉神经引起的反射性血管扩张反应不旅行的CTNP。5.这些结果表明，有一个双神经支配的猫下唇由两组副交感神经血管扩张纤维;在一种情况下，来自面神经根的纤维分布到下唇通过CTNP，CLN和IAN和其他纤维从舌咽神经根项目通过下颌神经和IAN下唇。
1. Electrical stimulation of the peripheral cut ends of the chorda tympani nerve proper (CTNP) and the chorda‐lingual nerve (CLN) elicited a blood flow increase in the ipsilateral lower lip, tongue and submandibular gland in a stimulus intensity‐dependent manner in anaesthetized cats. 2. Pretreatment with hexamethonium (1.0 mg kg‐1, i.v.), an autonomic ganglionic blocker, significantly reduced the CTNP‐induced blood flow increases in all of the above three sites as well as the CLN‐induced blood flow in the lower lip, but it had no effects on the CLN‐induced blood flow increases in the tongue and submandibular gland. 3. The CTNP stimulation‐induced lower lip blood flow was not influenced by sectioning the lingual nerve proper, but it was abolished by section of either the CLN or the inferior alveolar nerve (IAN) in the mandibular canal. 4. The lip blood flow increases elicited reflexly by electrical stimulation of the upper gingiva, the central cut ends of the mylohyoid nerve and CLN were not affected by cutting of the CTNP, but were markedly reduced by pretreatment with hexamethonium and abolished by the section of the inferior alveolar nerve just distal to the mylohyoid nerve. These observations imply that the parasympathetic vasodilator fibres involved in trigeminally induced reflex vasodilatation responses do not travel with the CTNP. 5. These results suggest that there is a dual innervation of the cat lower lip by two groups of parasympathetic vasodilator fibres; in one case fibres originating from the facial nerve root are distributed to the lower lip via the CTNP, CLN and IAN and in the other fibres emanating from the glossopharyngeal nerve root project to the lower lip via the mandibular nerve and the IAN.