RT Journal Article
SR Electronic
T1 Imaging findings of the developing temporal bone in fetal specimens.
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 1467
OP 1477
VO 17
IS 8
A1 W R Nemzek
A1 H A Brodie
A1 B W Chong
A1 C J Babcook
A1 S T Hecht
A1 S Salamat
A1 W G Ellis
A1 J A Seibert
YR 1996
UL http://www.ajnr.org/content/17/8/1467.abstract
AB 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.