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tu zi jing bu di er he di san dui jing shen jing fu gen zhong de xue guan yun dong xian wei
Pages: 110-118
Year: Issue:  2
Journal: Acta Physiologica Sinica

Keyword:  舒血管血管运动刺激灌注液小耳颈神经摘除血管舒张脊髓耳部;
Abstract: Experiments on the vasomotor fibres in the cervical spinal nerves were perform- ed by section of the ventral roots of the second and the third cervical spinal nerves of rabbits. Then electric stimulation was applied to the small auricular nerve of the second cervical spinal nerve and to the great auricular nerve of the third.The observation was made in situ and recorded by means of the droppings of the perfusion fluid through the ear blood vessels in vitro. It was found that the section of the second cervical nerve root causes the dilatation of the blood vessels of the anterior part of the ear while section of the third cervical nerve causes vasodi- latation of the posterior part.The electric stimulation on the distal ends of the small and great auricular nerves provokes a vasoconstriction which is increased by nicotine in both the normal animals and in those preparations in which sympathetic fibres from the superior cervical ganglion have been degenerated. Above findings prove that the vasomotor fibres are leaving the ventral roots of the second and third cervical spinal nerves to innervate the ear blood vessels by the way of the small and great auricular nerves respectively.
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