下面是一张左手手背的图解,可以帮助你理解左手背的各个部分:

```
手背侧面图
|
[ wrist ]
/ \
[ thumb metacarpal ] [ index metacarpal ]
| |
[ thumb phalanx 1 ] [ index phalanx 1 ]
| |
[ thumb phalanx 2 ] [ index phalanx 2 ]
| |
[ thumb phalanx 3 ] [ index phalanx 3 ]
| |
[ thumb phalanx 4 ] [ index phalanx 4 ]
| |
[ thumb phalanx 5 ] [ index phalanx 5 ]
[ middle metacarpal ] [ ring metacarpal ]
| |
[ middle phalanx 1 ] [ ring phalanx 1 ]
| |
[ middle phalanx 2 ] [ ring phalanx 2 ]
| |
[ middle phalanx 3 ] [ ring phalanx 3 ]
| |
[ middle phalanx 4 ] [ ring phalanx 4 ]
| |
[ middle phalanx 5 ] [ ring phalanx 5 ]
[ little metacarpal ] [ pinky metacarpal ]
| |
[ little phalanx 1 ] [ pinky phalanx 1 ]
| |
[ little phalanx 2 ] [ pinky phalanx 2 ]
| |
[ little phalanx 3 ] [ pinky phalanx 3 ]
| |
[ little phalanx 4 ] [ pinky phalanx 4 ]
| |
[ little phalanx 5 ] [ pinky phalanx 5 ]
```
图解中的部分包括:
- `wrist`:手腕
- `metacarpal`:掌骨
- `phalanx`:指骨
- `thumb`:拇指
- `index`:食指
- `middle`:中指
- `ring`:无名指
- `pinky`:小指
请注意,这是一个简化的图解,实际手背结构可能更复杂,包含更多的肌肉、神经和血管等。
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