Loading AI tools
来自维基百科,自由的百科全书
頸
舌骨下肌共有四對,頸襻支配其中三對:
頸襻具有上下兩個神經根。
頸襻上神經根(superior root of the ansa cervicalis)源於C1,神經纖維經過舌下神經,再分叉形成頸襻上神經根。上根進入頸動脈三角,繞過枕動脈,下降進入頸動脈鞘,分出支配肩胛舌骨肌上腹、胸甲肌及胸舌骨肌上半的肌肉支,最後與下神經根吻合。
頸襻下神經根(inferior root of the ansa cervicalis),又稱頸降神經(descendens cervicalis),源於C2及C3,支配肩胛舌骨肌下腹、胸甲肌及胸舌骨肌下半,最後與上神經根吻合。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.