Solidot: 塞舌蛙无耳朵借助口腔听声音

Solidot

奇客的资讯，重要的东西

塞舌蛙无耳朵借助口腔听声音
http://solidot.org.feedsportal.com/c/33236/f/556826/s/30bd0c9b/sc/21/l/0L0Ssolidot0Borg0Cstory0Dsid0F3630A0A/story01.htm
Sep 3rd 2013, 12:27

生活在塞舌尔群岛的塞舌蛙是世界上最小的蛙类动物之一，它没有包含鼓膜的中耳，但仍然可以呱呱叫，听到其它蛙类的声音。一个国际研究小组利用X射线解开了这一谜团，发现这些蛙类用口腔和相关组织将声音传送到内耳。研究结果发表在PNAS上。动物的听觉能力出现在大约2亿到2.5亿年前，其听觉器官主要是利用鼓膜和听骨链构成的中耳，蛙类与其它动物存在显著不同，它们没有外耳，包含鼓膜的中耳直接位于头部表面，传入的声波振动鼓膜，鼓膜通过听骨链将振动传输到内耳，内耳的耳毛细胞将声音转化为电信号发送到大脑。如果没有中耳，99.9%的声波会被发射掉。对塞舌蛙的研究揭示了一种新的听觉机制，结合口腔和骨传导，塞舌蛙可以不通过中耳有效感知声音。This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers. Five Filters recommends: Massacres That Matter - Part 1 - 'Responsibility To Protect' In Egypt, Libya And SyriaMassacres That Matter - Part 2 - The Media Response On Egypt, Libya And SyriaNational demonstration: No attack on Syria - Saturday 31 August, 12 noon, Temple Place, London, UK



You are receiving this email because you subscribed to this feed at http://blogtrottr.com

If you no longer wish to receive these emails, you can unsubscribe here:
http://blogtrottr.com/unsubscribe/cz0/jPbdSR