الفهرس 
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Abstract
The infracochlear cell tract is a highly variable anatomical space that embryologically develops between the fustis and the finiculus.
Previous literature has documented the uses of ICT as a potential hearing preserving approach to the petrous apex and internal auditory canal. The tunnel is also of valuable significance in cochlear implant surgeries.
The present study was carried out on 50 ears operated on patients requiring middle ear surgery at the Alexandria Main University Hospital as well as HRCT from 41 temporal bone scans examined bilaterally (82 sides). 6 temporal bone sides were also dissected for anatomical description. There was no statistical significance between the sides nor the sex of the patients in relation to the ICT.
The ICT was present in 52.17% of the study population and 50% of those from the same demographic region. Anatomically type B tunnel was the most prevalent 28/56 (50%), type C were 20/56 (35.71%), and 8/56 (14.29%) had type A tunnel. Radiologically ICT was detected in 43.9%. type 1 was most prominent and constituted 46/82 (56.10%), 24/82 (29.72%) had a type 2 tunnel, and type 3 and 4 had equal distribution 6/82(7.32%)