SENSORY TRIGEMINAL SYSTEM OF A SNAKE IN POSSESSION OF INFRARED RECEPTORS .2. CENTRAL PROJECTIONS OF TRIGEMINAL NERVE
SENSORY TRIGEMINAL SYSTEM OF A SNAKE IN POSSESSION OF INFRARED RECEPTORS .2. CENTRAL PROJECTIONS OF TRIGEMINAL NERVE
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DOI：
10.1002/cne.901790109
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发表时间：
1978-01-01
影响因子：
2.5
通讯作者：
MOLENAAR, GJ
中科院分区：
文献类型：
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作者：
MOLENAAR, GJ
用Fink-Heimer技术研究了网状蟒蛇三叉神经感觉根在三叉神经节和脑干之间的中枢投射。感觉三叉神经纤维分布到前面描述的2个独立的感觉三叉神经系统，即，共同感觉神经和三叉神经外侧降支系统。三叉神经周围支的投射仅限于各自的神经束和神经核的区域。一般来说，眼神经根最突出腹侧，下颌神经根最突出背侧，上颌神经根居中。眼分支下降至第1颈神经根水平;上颌和下颌分支继续超出第2颈神经根。三叉神经感觉纤维的分布与其他脊椎动物有两个主要的不同。第一个区别是下颌根和上颌根的投影区域有很大的重叠。这种重叠可能发生在其他哺乳动物，物种进行了讨论。第二个主要区别是投射到三叉神经外侧降核。该侧降系统中的退化纤维和终扣的形态与共同感觉系统中的退化纤维和终扣的形态明显不同。初步记录表明，共同感觉系统和侧降系统的项目在中脑和间脑的不同地区。三叉神经外侧降束的核显然专门负责处理由窝器官传递的IR信息。在其他脊椎动物中存在一个单独的三叉神经系统的可能性，相当于侧降三叉神经系统的蟒蛇，进行了讨论。
The central projections of the sensory roots of the trigeminal nerve in Python reticulatus were studied by the Fink-Heimer technique following transection of these roots between the trigeminal ganglia and the brainstem. The sensory trigeminal fibers are distributed to the 2 separate sensory trigeminal systems described before, i.e., the common sensory and the lateral descending trigeminal system. The projections of the 3 peripheral trigeminal branches are restricted to their own territories of the various tracts and nuclei. Generally the ophthalmic root projects most ventrally, the mandibular root most dorsally and the maxillary root intermediately. The ophthalmic branch descends until the level of the 1st cervical nerve root; the maxillary and mandibular branches proceed beyond the 2nd cervical nerve roots. The distribution pattern of the sensory trigeminal fibers differs in 2 major aspects from that of other vertebrates. The 1st difference is a large overlap of the projection areas from the mandibular and maxillary roots. The probable occurrence of this overlap within other, mammalian, species is discussed. The 2nd major difference is the projection into the lateral descending trigeminal nucleus. The morphology of the degenerating fibers and boutons terminaux in this lateral descending system is markedly different from that within the common sensory system. Preliminary notes were presented to show that the common sensory and the lateral descending systems project to different areas in the mesencephalon and diencephalon. The nucleus of the lateral descending trigeminal tract is apparently exclusively concerned in processing the IR information relayed by the pit organs. The possibility of the presence of a separate trigeminal system in other vertebrates, equivalent to the lateral descending trigeminal system of the python, is discussed.