三叉神经和颈神经初级传入纤维在延髓内重叠投射的观察

作以ＨＲＰ跨节追踪法研究了三叉神经中的眶上神经、眶下神经及下牙槽神经在上部颈髓后角的下行投射和上部颈神经在三叉神经脊束核的上行投射。结果表明：眶上神经、眶下神经及下牙槽神经分别向第１，２，３颈髓后角的腹外侧、中间部及背内侧投射，第２，３颈神经向脊髓后角的广泛区域投射。此外，在三叉神经尾侧亚核和吻侧亚核也能见到来自上部颈神经的阳性纤维和终末。眶上神经、眶下神经、下牙槽神经及上部颈神经在三叉神经脊束

The overlapping projections of the trigeminal and cervical spinal nerve primary afferent neurons in the medulla

The central projections of trigeminal primary afferent fibers including supraorbital,infraorbital, inferior alveolar and upper cervical spinal nerves to trigeminal brainstem nuclear complex(TBNC)have been investigated by using the method of transganglionic transport of horseradish peroxidase(HRP).The results showed that supraorbital,infraorbital,inferior alveolar and upper cervical spinal nerves projected to ventro-lateral part,medial part, and dorso-medial part of C1-C3 dorsal horn. The fibers from C2-C3 projected heav-ily to the dorsal horn of the segment of entrance, and the fibers from C1 only projected to dorsal-medial part of dorsal horn.In nucleus tractus spinalis trigemini caudalis(Vspc) and nucleus tractus spinalis trigemini o-rilis (Vspo),many HRP-labeled fibers and terminals originating from C1-C3 have been found.It is suggested that the overlapping and somatotopical organization projections of trigeminal and cervical nerves in TBNC and upper cervical dorsal horn converge on neurons projecting to the thalamus and are related to perception and transmission of pain information from the head and face region. The relation of the present results to the meridian theory was discussed.