CONNECTIONS OF THE SUPERIOR OLIVARY COMPLEX IN THE RUFOUS HORSESHOE BAT RHINOLOPHUS-ROUXI
CONNECTIONS OF THE SUPERIOR OLIVARY COMPLEX IN THE RUFOUS HORSESHOE BAT RHINOLOPHUS-ROUXI
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DOI：
10.1002/cne.902780302
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发表时间：
1988-12-15
影响因子：
2.5
通讯作者：
VATER, M
中科院分区：
文献类型：
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作者：
CASSEDAY, JH;COVEY, E;VATER, M
在红掌蝙蝠(Rhinolophus Rouxi)中，上橄榄复合体包括四个主要部分。与其他物种相比，最外侧的分裂明显与上橄榄的外侧核(LSO)同源，最内侧的分裂与斜方体体的内侧核(MNTB)同源。在这些地标之间，大约在其他哺乳动物的内侧上橄榄(MSO)的位置上，还有两个额外的部分，它们在细胞结构上彼此不同，但与猫等非回声定位哺乳动物的MSO并不是很相似。我们将这些核团称为背侧内侧上橄榄核(DMSO)和腹侧内侧上橄榄核(VMSO)。我们检查了所有这些细胞组的传入和传出联系，以及来自上橄榄复合体的WGA-HRP的逆行和顺行运输。在相同的动物中，我们记录了上橄榄复合体中单个单位的双耳反应特性。LSO中记录的几乎所有单位对同侧耳(EI)兴奋，对侧耳(EI)抑制；所有在MNTB中采样的单位和在VMSO中采样的大部分单位仅对对侧耳(OE)起反应。在DMSO中，单位的双耳特性是不同的：对同侧耳抑制和对侧耳兴奋的单位数(IE)大约等于对双耳兴奋的单位数(EE)；少数单位有OE反应；没有单位有EI反应。这些双耳反应特性的关联关系可见于上橄榄部分WGA-HRP注射的逆行运输模式。LSO接受同侧耳蜗核和MNTB的投射，MNTB接受对侧耳蜗核的投射。DMSO和VMSO都接受来自耳蜗核的双侧投射。逆行和顺行运输的结果表明，VMSO还接受同侧MNTB的投射。LSO、DMSO和VMSO均投射到下丘中央核腹侧2/3处，其靶点大致相同。然而，LSO投射到双侧下丘，而内侧细胞群主要投射同侧。
In the rufous horseshoe bat (Rhinolophus rouxi), the superior olivary complex contains four main divisions. In comparison with other species, the most lateral division is clearly homologous to the lateral superior olive (LSO); the most medial division is homologous to the medial nucleus of the trapezoid body (MNTB). Lying between these landmarks, in approximately the position of the medial superior olive (MSO) of other mammals, are two additional divisions that are cytoarchitecturally distinct from one another yet do not greatly resemble the MSO of nonecholocating mammals such as the cat. We refer to these nuclei as the dorsal medial superior olive (DMSO) and the ventral medial superior olive (VMSO). We examined the afferent and efferent connections of all of these cell groups with retrograde and anterograde transport of WGA-HRP from the superior olivary complex. In the same animals we recorded the binaural response properties of single units in the superior olivary complex. Virtually all units recorded in LSO were excitatory to the ipsilateral ear and inhibitory to the contralateral ear (EI); all of the units sampled in the MNTB and most of those sampled in the VMSO responded only to the contralateral ear (OE). In DMSO the binaural properties of units were varied: the number of units that were inhibitory to the ipsilateral ear and excitatory to the contralateral ear (IE) was about equal to the number of units excitatory to both ears (EE); a few units had OE responses; no units had EI responses. Connectional correlates for these binaural response properties are seen in the patterns of retrograde transport from WGA-HRP injections in the divisions of the superior olive. The LSO receives projections from the ipsilateral cochlear nucleus and MNTB; MNTB receives projections from the contralateral cochler nucleus. The DMSO and VMSO both receive bilateral projections from the cochlear nuclei. The results of retrograde and anterograde transport suggest that VMSO, in addition, receives projections from the ipsilateral MNTB. The LSO, DMSO, and VMSO all project to the ventral two-thirds of the central nucleus of the inferior colliculus, and their targets are approximately coextensive. However, the LSO projects bilaterally to the inferior colliculus, whereas the medial cell groups project mainly ipsilaterally.