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腰丛
学习目标
完成本学习单元后，你将能够：
- 识别构成腰丛的脊神经节段。
- 列举腰丛的终末分支及其支配区域。
浏览图谱
腰丛为位于腰盆区深部、邻近腰大肌的一组脊神经丛。腰丛由第1-4腰神经前支构成，主要支配骨盆与大腿前外侧部的肌肉、关节及皮肤。
腰丛具有6支主要终末分支。根据解剖位置，可分为前部与后部。前部主要支配盆腔结构，后部主要发出分支至大腿。第4腰神经部分纤维与第五腰神经 纤维汇合形成腰骶干。该粗大神经干连接腰丛与骶丛，因此两者常合称为腰骶丛。腰丛与骶丛共同支配盆腔及下肢的全部神经分布。
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第12胸椎
Vertebra T12
1/23
同义词：
T12
进行测验
完成以下测验，检验对腰丛的掌握程度。
小结
| 神经根 | 脊神经 L1、L2、L3、L4 |
| 结构组成 |
来自脊神经 L1 的分支 来自脊神经 L2–L4 前支的分支 来自脊神经 L2–L4 后支的分支 |
| 终末分枝 |
髂腹下神经 髂腹股沟神经 股生殖神经 闭孔神经 股外侧皮神经 股神经 |
| 功能 |
运动：支配腹壁肌群、髋关节屈肌、膝关节伸肌 感觉：支配下腹部、髋部/腹股沟区/生殖区、大腿（除后侧外）及小腿内侧皮肤 |
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