单选题某6岁小儿，体格检查发育良好，其腕部骨化中心约为多少：（）A4个B5个C6个D7个E8个
单选题
某6岁小儿，体格检查发育良好，其腕部骨化中心约为多少：（）
A
4个
B
5个
C
6个
D
7个
E
8个
参考解析
解析：
出生后腕部骨化中心出现顺序为：头状骨、钩骨（3～4个月），下桡骨骺（约1岁），三角骨（2～3岁），月骨（3岁左右），大、小多脚骨（3.5～5岁），舟骨（5～6岁），下尺骨骺（6～8岁），豌豆骨（9～10岁）。10岁时出全，共10个，故1～9岁腕部骨化中心的数目约为其岁数加1。
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