頸
舌骨下肌共有四對,頸襻支配其中三對:
- 胸舌骨肌
- 胸甲肌
- 肩胛舌骨肌
神經根
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。
圖像
-
紫色部分由頸神經叢支配。
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頸襻的結構。
-
臂神經叢圖,頸襻在畫面右上方,標為「Ansa hypoglossi」。
-
頸神經叢。
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新生兒解剖:頸部肌肉、血管、神經。畫面中可明顯看見頸襻。
參考資料
- "Ansa cervicalis." Stedman's Medical Dictionary, 27th ed. (2000). ISBN 0-683-40007-X
- Gray's Anatomy: The Anatomical Basis of Clinical Practice. (2005). ISBN 0-443-07168-3
外部連結
- Anatomy figure: 25:03-08 at Human Anatomy Online, SUNY Downstate Medical Center
- Photo and description at Tufts University
- MedicalMnemonics.com: 1042
- https://web.archive.org/web/20080304085514/http://www.med.mun.ca/anatomyts/nerve/cerplex.htm
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