Sensory innervation in the inner conical body of the vibrissal follicle-sinus complex of the rat.
Sensory innervation in the inner conical body of the vibrissal follicle-sinus complex of the rat.
复制标题
大鼠触毛毛囊-窦复合体内圆锥体的感觉神经支配。
DOI：
10.1002/cne.903280206
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Song,MJ
中科院分区：
文献类型：
--
作者：
Mosconi,TM;Rice,FL;Song,MJ
通过连续和半连续切片的高压和常规透射电子显微镜检查大鼠触须毛囊-窦复合体内锥体的神经支配。内锥体由轴突支配，轴突几乎完全由几条浅触须神经支配，这些浅触须神经起源于三叉神经的眶下分支，并会聚在滤泡-窦复合体的颈部。每个浅触须神经含有少量Aδ有髓轴突和数束20-30个无髓轴突。这些轴突进入内锥体，并在7-10个环状阵列内周向分布，这些阵列环绕触须毛囊，并通过内锥体的浅表到深部堆叠。每个环由1或2个有髓轴突和几个小束的2-15个无髓轴突包围在平行的胶原纤维束。有髓鞘的轴突提供唯一的披针形的结束，可能会出现在轴突的终止或在节点的兰维尔。在小束内，无髓鞘轴突单独连续终止为突然的细胞质泡，称为细胞质泡，其含有线粒体或透明或致密核心囊泡簇。由于它们与胶原纤维的联系和有髓轴突的接近，在以前的研究中，起泡的末梢可能被误解为Ruffini末梢。它们的结构，分布和起源于无髓鞘轴突表明，起泡末梢可能构成了一个独特的低阈值C机械感受器阵列。© 1993 Wiley利斯公司
The innervation of the inner conical body of the vibrissal follicle‐sinus complex of the rat was examined by high‐voltage and conventional transmission electron microscopy of serial and semi‐serial sections. The inner conical body is innervated by axons supplied almost exclusively by several superficial vibrissal nerves that arise from the infraorbital branch of the trigeminal nerve and converge upon the neck of the follicle‐sinus complex. Each superficial vibrissal nerve contains a few Aδ myelinated axons and several bundles of 20–30 unmyelinated axons. These axons enter the inner conical body and distribute circumferentially within 7–10 ring‐like arrays that encircle the vibrissal follicle and are stacked through the superficial‐to‐deep extent of the inner conical body. Each ring consists of 1 or 2 myelinated axons and several small bundles of 2–15 unmyelinated axons enclosed in sheaves of parallel collagen fibrils. Myelinated axons provide exclusively lanceolate endings that may arise at the termination of the axon or at nodes of Ranvier. Within the small bundles, unmyelinated axons individually terminate in succession as abrupt cytoplasmic swellings referred to as cytoplasmic blebs, which contain mitochondria or clusters of clear or dense‐core vesicles. Because of their affiliation with collagen fibrils and the proximity of myelinated axons, the blebbed endings may have been misinterpreted as Ruffini endings in previous studies. Their structure, distribution, and origin from unmyelinated axons suggest that the blebbed endings may constitute a unique array of low‐threshold C‐mechanoreceptors. © 1993 Wiley‐Liss, Inc.