在妊娠16周,胎儿的槌骨和砧骨几乎达到了成人大小,此时槌骨和砧骨也开始骨化,直到出生时骨化尚未完成。为了解出生后听骨的骨化过程,选取32具足月出生,年龄1天～9岁的婴儿及儿童颞骨进行研究。将颞骨用10%福尔马林固定,5%三氯乙酸或10%依地酸脱钙,酒精脱水,火棉胶包埋,于水平面 At 16 weeks gestation, the fetus’s malleus and incus almost reached adult size, and the mallet and incus began to ossify until the ossification was not completed at birth. To understand the process of ossification of the ossicles after birth, 32 infants and children with full-term birth, aged from 1 day to 9 years old, were selected to study the temporal bone. The temporal bone was fixed with 10% formalin, 5% trichloroacetic acid or 10% decalcification of edetic acid, alcohol dehydration, collodion embedded, in the horizontal plane