![[枕动脉]降支 - 头部和颈部CT - 轴 - e-Anatomy](https://cdn.imaios.cn/i/imaios-images/web/images/eanatomy/modules/Head-Neck-CT/images/v1/b6bc0aee68a6b55a48516bb3f42e50a0475e097b46e2a6d71bcddc102c39183e?ar=640:670&auto=format,compress&bg=000000&fit=crop&p64=MTk1LDQ1NA&t=W-aeleWKqOiEiV3pmY3mlK8&tf=Tm90byBTYW5zIFND&tx=195&ty=454&w=350&wk=1&s=2aa9da22a53348c10ff87b1a4fe4f11d)
[枕动脉]降支
Ramus descendens arteriae occipitalis
- 相关用语: [枕动脉]降支 (枕动脉)
定义
枕动脉的降支是枕动脉最大的分支，沿颈后部下行，并分为浅部和深部。
- 浅部走行于头夹肌深面，发出穿经该肌的分支，供应斜方肌，并与颈横动脉升支相吻合。
- 深部在头半棘肌与颈半棘肌之间下行，与椎动脉及颈深动脉（肋颈干的分支）相吻合。
上述血管之间的吻合有助于在结扎颈总动脉或锁骨下动脉后建立侧支循环。
參考資料
This definition incorporates text from the wikipedia website - Wikipedia: The free encyclopedia. (2004, July 22). FL: Wikimedia Foundation, Inc. Retrieved August 10, 2004, from http://www.wikipedia.org
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