8/29/2023 0 Comments Internal auditory canal ct anatomyThese data may also be helpful in the presurgical evaluation of patients undergoing singular neurectomies for benign positional vertigo. Separates the descending portion from the horizontal tympanic segment. This study provides baseline measurements that may be used to evaluate congenital anomalies of these canals. These small canals are routinely visualized on thin section (1 mm) CT of the temporal bone and should not be confused with fractures. The internal auditory canal (IAC), also referred to as the internal acoustic meatus lies in the temporal bone and exists between the inner ear and posterior. Mean +/- SD measurements (in mm) of the length and width were as follows: BCFN = 2.92+/-0.48 and 0.91+/-0.28 BCSVN = 2.36+/-0.53 and 0.89+/-0.28 BCNC = 0.93+/-0.21 and 2.13+/-0.44 and SC = 3.22+/-0.73 and 0.50+/-0.14. a Axial plane, at the level of the mid epitympanum: 1 head of malleus, 2 body of incus, 3 short process of incus, 4 mastoid antrum, 5 tympanic segment of facial nerve, 6 geniculate ganglion, 7 cochlea, 8 vestibule, 9 vestibular aqueduct, 10 internal auditory canal. The BCFN, BCSVN, and BCNC arise from the fundus of the IAC, whereas the SC arises medial to the fundus. The BCFN, BCSVN, and BCNC were identified in all studies, whereas the SC was seen in 93% of studies. No patient had a prior history of trauma, vertigo, and sensorineural hearing loss or facial nerve paralysis. Measurements of the canals were performed by one radiologist. CT studies were done using 1-mm-thick contiguous sections in axial and coronal planes. The ear canal and outer cartilage of the ear make up. The ear has outer, middle, and inner portions. All the patients underwent high resolution temporal bone CT for evaluation of uncomplicated inflammatory (n = 49) and neoplastic (n = 1) diseases involving the temporal bone. The ear canal, or auditory canal, is a tube that runs from the outer ear to the eardrum. The purpose of this work was therefore to characterize the normal appearance of the four bony canals and to measure their dimensions.Ī retrospective study was performed using CT studies of the temporal bones in 50 patients to identify and characterize the bony canals for the labyrinthine segment of the facial nerve (BCFN), superior vestibular nerve (BCSVN), cochlear nerve (BCNC), and the inferior vestibular nerve (singular canal SC) located at the fundus of the IAC. Knowledge of the normal anatomy of the four bony canals located at the fundus of the internal auditory canal (IAC) is necessary during evaluation of temporal bone trauma, congenital anomalies affecting the individual nerves, and some neuro-otologic surgeries.
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