胸锁乳突肌发育畸形罕见。笔者从事招飞体检20多年仅遇到1例,现报道如下: 1 临床资料 患者,男性,18岁,湖北汉川人,1999年高中毕业生,同年9月入飞行预备学院。查体发现胸锁乳突肌的两个头,即胸乳突肌和锁乳突肌明显分离,各自独立,不像正常人那样向上合并成一组肌肉。而且锁乳突肌下端不是止于锁骨的胸骨端,而是止于锁骨的中 Sternocleidomastoid muscle development deformity rare. The author engaged in a flying examination more than 20 years only encountered 1 case, are reported as follows: 1 clinical data patients, men, 18 years old, Hanchuan in Hubei Province, 1999 high school graduates, the same year in September into the flight preparation college. Physical examination found that the two sternocleidomastoid head, that is, breast and mastoid muscles are clearly separated, independent of each other, unlike the normal human up into a group of muscles. And locking the lower end of the mastoid muscle is not limited to the sternum in the clavicle, but only in the clavicle