Microstructure and innervation of the mystacial vibrissal follicle-sinus complex in bearded seals, Erignathus barbatus (Pinnipedia: Phocidae)
Microstructure and innervation of the mystacial vibrissal follicle-sinus complex in bearded seals, Erignathus barbatus (Pinnipedia: Phocidae)
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DOI：
10.1002/ar.a.20273
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发表时间：
2006-01-01
期刊：
影响因子：
--
通讯作者：
Lydersen, C
中科院分区：
文献类型：
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作者：
Marshall, CD;Amin, H;Lydersen, C
触觉毛囊-鼻窦复合体(F-SCs)是哺乳动物被膜系统的感觉受体。他们是最好的发展在皮尼百科。本研究的目的是研究须海豹(Erignapus Barbatus)的F-SCs对底栖觅食的适应性。胡海豹大约有244个肌间充质干细胞。在该物种中，F-SCs由包围血窦系统[上海绵窦(USC)、环窦(RS)和下海绵窦(LCS)]的外皮被膜(DC)和同心的表皮组织环组成。其长度约占F-SC长度的62%，对机械感受器可能具有热保护作用。RS内可见一大型非对称性环状突起。深振动神经在DC的底部穿入，终止于LCS和RS表皮组织中的机械感受器。每个F-SC的平均有髓轴突数量为1,314个(范围为811-1,650个)，是迄今报道的每个F-SC中最多的轴突数量之一。据估计，平均有320,616个有髓轴突支配整个肌群。在LCS区域可见Merkel-轴突复合体(MNC)和小的单层小体。有髓轴突也终止于单核细胞和环状突起顶端的披针形末端。F-SCs的数量、它们在肌间区的几何形状、每个F-SC的有髓轴突数量以及机械感受器的分布支持这样一个假设，即羽足海豹是敏感的主动触摸感受器系统，而须海豹相对于其他海豹的结构差异可能是适应底栖生物觅食的基础。(C)2005年Wiley-Liss，Inc.
Vibrissal follicle-sinus complexes (F-SCs) are sensory receptors of the mammalian integument system. They are best developed within Pinnipedia. The objective of this study was to investigate the F-SCs of bearded seals (Erignathus barbatus) for benthic foraging adaptations. Bearded seals possessed approximately 244 mystacial F-SCs. In this species, F-SCs consisted of an outer dermal capsule (DC) surrounding a blood sinus system [upper cavernous sinus (UCS), ring sinus (RS), and lower cavernous sinus (LCS)] and concentric rings of epidermal tissue. The UCS comprised up to 62% of the F-SC length and may function as thermal protection for mechanoreceptors. A large asymmetrical ringwulst was located in the RS. A deep vibrissal nerve penetrated the DC at its base and terminated on mechanoreceptors in the epidermal tissues of the LCS and RS. The mean number of myelinated axons per F-SC was 1,314 (range, 811-1,650) and was among the highest number of axons per F-SC reported to date. An estimated mean number of 320,616 myelinated axons innervate the entire mystacial vibrissal array. Merkel-Neurite complexes (MNCs) and small simple laminated corpuscles were found in the region of the LCS. Myelinated axons also terminated on MNCs and lanceolate endings apical to the ringwulst. The number of F-SCs, their geometry in the mystacial region, the number of myelinated axons per F-SC, and the distribution of mechanoreceptors support the premise that pinniped vibrissae are sensitive active-touch receptor systems, and that structural differences in bearded seals, relative to other phocids, may be adaptations for benthic foraging. (C) 2005 Wiley-Liss, Inc.