Within the FIAM runs horizontally transverse crest which separates the fundus into two parts: superior and inferior, as it is presented in Figure 1.įigure 1. The FIAM transmits from the cranial cavity to ear the following structures : facial nerve, intermediate nerve, labyrinthine artery and vestibulocochlear nerve which divides near the lateral end of IAM into a two parts: a cochlear nerve and vestibular nerve. The height and width of the FIAM range from 2.5 to 4.0 mm and from 2.0 to 3.0 mm, respectively. The FIAM constitutes also the medial wall of the labyrinth. This plate separates the cochlea and vestibule from the IAM, and is defined as a fundus of the internal acoustic meatus (FIAM). Lateral end of the IAM is formed by the thin cribriform plate of bone. The entire canal has a length of about 1 cm and extends laterally inside the bone. Internal acoustic meatus (IAM) is a canal which is terminated with a fundus located inside the pyramid of the temporal bone. Key words: internal acoustic meatus, petrous bone, micro-computed tomography In the studied material we did not find out any statistically significant difference between mean diameters calculated for infant and adult individuals. Hence, we estimated the size of each area of the FIAM by measuring their minimal and maximal diameter. Application of this technique allows finding out new anatomical structures like the foramen of the transverse crest, which is not described in literature. We figured out that 3D reconstructions obtained from micro-CT scans can precisely demonstrate all areas of the FIAM (facial nerve area, cochlear area, superior and inferior vestibular areas, singular foramen). By using micro-CT we obtain detailed volume rendering images presenting topography of the FIAM in 3-dimensional (3D) space. The aim of this paper was to present micro-computed tomography (micro-CT) high resolution images of the fundus of internal acoustic meatus (FIAM) and characterise the normal appearance of its singular areas which are places of passage of numerous anatomical structures. Kopernika 12, 31–034 Kraków, Poland, e-mail: 11 September 2014 Accepted 23 November 2014] Kozerska, MSc, Department of Anatomy, Collegium Medicum, Jagiellonian University, ul.
Anatomy of the fundus of the internal acoustic meatus - micro-computed tomography studyĭepartment of Anatomy, Jagiellonian University, Collegium Medicum, Krakow, PolandĪddress for correspondence: M.
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