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CT scan of normal temporal bone, photographed in bone window. Axial images (A) to (G) are inferior to superior. Legend for parts (H) to (K) appears on page 151. CT scan of normal temporal bone, photographed in bone window. Axial images (A) to (G) are inferior to superior. CT scan of normal temporal bone, photographed in bone window. Coronal images (H) to (K) are anterior to posterior. Abbreviations: AA, aditus ad antrum; CF, crista falciformis; CN7,ds, CN VII, descending mastoid segment; CN7,ls, CN VII, labyrinthine segment; CN7,ts, CN VII, tympanic segment; Co, cochlea; Co,at, cochlea, apical turn; Co,bt, cochlea, base turn; Co,mt, cochlea, middle turn; EAC, external auditory canal; ELS dep, endolymphatic sac depression; epi, epitympanum; FNR, facial nerve recess; GG, geniculate ganglion; GSPN, greater superficial petrosal nerve; hypo, hypotympanum; IAC, internal auditory Source: Chapter 3. Radiology, CURRENT Diagnosis & Treatment in Otolaryngology—Head & Neck Surgery, 3e canal; ICA, internal carotid artery; In, incus; ISA, incudostapedial articulation; Ma, malleus; meso, mesotympanum; Mo, modiolus; MIA, malleoincudal Citation: AK. CURRENT & Treatment Otolaryngology—Head & Neck Surgery, 2012 Sc, Available at: SCC,l, semicircular articulation; OW, ovalLalwani window; PE, pyramidalDiagnosis eminence; PA, porus inacusticus; *, Prussak space; RW, round 3e; window; scutum; http://mhmedical.com/ Accessed: May 13, 2017 canal, lateral; SCC,p, semicircular canal, posterior; SCC,s, semicircular canal, superior; St, stapes; ST, sinus tympani; TA, tympanic annulus; TM, CopyrightTT, © 2017 McGraw-Hill Education. rightstendon; reserved tympanic membrane; tegmen tympani; TTT, tensor All tympani V, vestibule; VA, vestibular aqueduct.