胎儿标本中颞骨发育的影像学表现。
Imaging findings of the developing temporal bone in fetal specimens.
作者信息
Nemzek W R, Brodie H A, Chong B W, Babcook C J, Hecht S T, Salamat S, Ellis W G, Seibert J A
机构信息
Department of Radiology, University of California Davis Medical Center, Sacramento, USA.
出版信息
AJNR Am J Neuroradiol. 1996 Sep;17(8):1467-77.
PURPOSE
To trace the development of the normal fetal temporal bone by means of plain radiography, MR, and CT.
METHODS
Eighteen formalin-fixed fetal specimens, 13.5 to 24.4 weeks' gestational age, were examined with a mammographic plain film technique, CT, and MR imaging at 1.5 T. Temporal bone development and ossification were assessed.
RESULTS
The membranous labyrinth grows with amazing rapidity and attains adult size by the middle of the gestation period. The cochlea, vestibule, and semicircular canals are very prominent and easily recognized on MR images. The otic capsule develops from a cartilage model. Ossification of the otic capsule proceeds rapidly between 18 and 24 weeks from multiple ossification centers that replace the cartilaginous framework. The mastoid, internal auditory canal, vestibular aqueduct, and external auditory canal continue to grow after birth.
CONCLUSION
The study of fetal developmental anatomy may lead to a better understanding of congenital disorders of the ear. Faster MR scanning techniques may provide a method for in utero evaluation of the fetal temporal bone.
目的
通过X线平片、磁共振成像（MR）和计算机断层扫描（CT）追踪正常胎儿颞骨的发育过程。
方法
对18例经福尔马林固定的胎儿标本进行检查，孕周为13.5至24.4周，采用乳腺X线平片技术、CT以及1.5T的MR成像。评估颞骨的发育和骨化情况。
结果
膜迷路生长迅速，在妊娠期中期达到成人大小。耳蜗、前庭和半规管在MR图像上非常突出且易于识别。耳囊由软骨模型发育而来。耳囊在18至24周之间从多个骨化中心迅速开始骨化，这些骨化中心取代了软骨框架。乳突、内耳道、前庭导水管和外耳道在出生后继续生长。
结论
胎儿发育解剖学的研究可能有助于更好地理解耳部先天性疾病。更快的MR扫描技术可能为胎儿颞骨的宫内评估提供一种方法。
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