Myslobodsky M S, Ingraham L J, Weinberger D R
St. Elisabeths Hospital, Washington, DC 20032.
Percept Mot Skills. 1987 Oct;65(2):415-21. doi: 10.2466/pms.1987.65.2.415.
During the first two to three months after delivery infants when placed in the supine position commonly turn their heads laterally. This posture has been linked to the intrauterine orientation of the fetus. Skulls of adults were expected to bear a mark of this predominant head position in the form of occipital flattening. A blind examination of computerized axial tomography (CT) scans of 35 normal subjects assessed for handedness (20 right- and 15 mixed-handers) confirmed this prediction for the latter group only. Mixed-handers showed a slight, but reliable flattening of the right occiput. Also, there was a small but significant inverse association between the size of the petrous ridge and handedness. Examining subtle variations in skull shape of adults may provide a glimpse into some aspects of pre- and early postnatal development.
在出生后的头两到三个月里，婴儿仰卧时通常会将头转向一侧。这种姿势与胎儿在子宫内的体位有关。人们预计成年人的头骨会以枕骨扁平的形式留下这种主要头部位置的印记。对35名接受利手评估的正常受试者（20名右利手和15名混合利手）的计算机断层扫描（CT）进行盲法检查，结果仅证实了后一组的这一预测。混合利手者右侧枕骨有轻微但可靠的扁平现象。此外，岩嵴大小与利手之间存在微小但显著的负相关。研究成年人头骨形状的细微变化可能有助于了解出生前和出生后早期发育的某些方面。
