Morphological differences between fast and slowly adapting lingual afferent terminations in the principal and oral nuclei in the cat

作     者：Moritani, M Yoshida, A Honma, S Nagase, Y Takemura, M Shigenaga, Y 

作者机构：Osaka Univ Fac Dent Dept Oral Anat Suita Osaka 565 Japan 

出 版 物：《JOURNAL OF COMPARATIVE NEUROLOGY》 (比较神经学杂志)

年 卷 期：1998年第396卷第1期

页      面：64-83页

核心收录：

学科分类：0710[理学-生物学] 1001[医学-基础医学(可授医学、理学学位)] 07[理学] 071003[理学-生理学] 

主　　题：mechanoreceptors structure-function relationships somatotopy intra-axonal HRP 

摘      要：Previous studies indicated that fast-adapting (FA) and slowly adapting (SA) mechanoreceptive afferents innervating the facial or intraoral structures give rise to morphologically distinct terminal arbors in the individual subdivisions of the trigeminal sensory nuclear complex. The present study examined the collateral morphologies of lingual afferents in the nuclei principalis (Vp) and oralis (Vo) of the cat. Seven FA and six SA lingual afferents were physiologically characterized and stained by the intra-axonal horseradish peroxidase (HRP) injection technique, The two types of afferents established terminal arbors in the dorsomedial subdivision (Vpd) of the Vp, and the rostrodorsomedial (Vo.r) and dorsomedial subdivisions (***) of the Vo, but the collateral morphologies are different between the two types. The FA afferents gave rise to mediolaterally extended oblong arbors in each subdivision, but the arbors were better developed in the Vo.r than in the Vpd and ***. The number of collaterals, intercollateral distance, number of boutons per collateral, and bouton size were also different among the subdivisions. The SA afferents were divided into two subtypes;one had a preferential projection into the Vpd or the Vo.r and ***, and others lacked a selected projection. Although the shape of their arbors varied from a stringy form to a roundish form, the general profile was denser, better developed, and rounder than that of FA afferents in each subdivision. The intercollateral distance and bouton size were different among the subdivisions. The number of boutons per collateral, bouton density, and bouton size were larger in SA than FA afferents in each subdivision. The present study demonstrated that two functionally distinct lingual afferents manifest unique morphological differences in the Vpd and Vo. (C) 1998 Wiley-Liss, Inc.