![]() Vein of cochlear aqueduct and vein of vestibular aqueduct) (1). Vascular content: arterial by the labyrinthine artery and venous with three drainage pathways (internal auditory vein, Magnetic resonance imaging (MRI) of the internal auditory canal (IAC) is a non-invasive, painless diagnostic imaging procedure that uses using radio waves and a strong magnetic field to create detailed images of the bony canal that transmits nerves and blood vessels from the base of the brain to the inner ear. In the postero-inferior quadrant of the fundus that can be often be observed with 3T imaging. The singular nerve (or the posterior ampullary nerve) has its proper canal, Nervous contents: the facial nerve (the largest in size) and the cochleo-vestibular nerve that divides into the cochlear nerve and the vestibular nerve which further divides itself into the superior (innervates the utricle and the ampulla of the superior and lateral SCC),Īnd the inferior branches (innervates the saccule and the ampulla of the posterior SCC). Of irregular shape (modulates the passage of the VII and VIII cranial nerves). The canal (an average of 8 mm) and the fundus, Has three parts: the internal acoustic meatus (medial opening), So we do not consider necessary an exhaustive review.Īs the emphasis is on the iconographic factor, This presentation focuses on the normal aspects of the inner ear as viewed when high field magnetic resonance studies are achieved, The medical literature needs to be revised and updated to the new findings. The internal auditory canal (IAC) is situated at the posterior aspect of the petrous part of the temporal bone. This state-of-the-art topic is evolving and numerous studies are currently performed. It lies between the middle ear and the internal acoustic meatus, which lie laterally. Radiologists need to be familiar with the normal appearance of the membranous labyrinth structures when performing inner ear studies (Drive and FLAIR Gd+ sequences). The inner ear is located within the petrous part of the temporal bone. Study of their shape and volume is easier with high field 3 Tesla MRI volumetric acquisitions,Īnd of clinical importance in Menière’s disease. The utricle and saccule for healthy subjects (7,8,9). The routine protocols include a Heavily T2 weighted sequence and a T1 weighted sequence with and without gadolinium enhancement.ĭelayed four hours acquisition after gadolinium intravenous injection has also proven selective enhancement of the perilymphatic spaces and thus negative outline of the endolymphatic structures, This article provides an overview of the principles of MR imaging and details of its use. Magnetic resonance is the modality of choice when investigating the inner ear. Magnetic resonance (MR) imaging is a useful modality for imaging soft tissue lesions of the temporal bone. ![]()
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