Health & Environmental Research Online (HERO)


Print Feedback Export to File
5939202 
Journal Article 
Imaging findings of the developing temporal bone in fetal specimens 
Nemzek, WR; Brodie, HA; Chong, BW; Babcook, CJ; Hecht, ST; Salamat, S; Ellis, WG; Seibert, JA 
1996 
Yes 
American Journal of Neuroradiology
ISSN: 0195-6108
EISSN: 1936-959X 
17 
8 
1467-1477 
English 
8883642 
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.