It also contains the vestibular ganglion. The internal auditory meatus provides a passage through which the vestibulocochlear nerve (CN VIII), the facial nerve (CN VII), and the labyrinthine artery (an internal auditory branch of the anterior inferior cerebellar artery in 85% of people) can pass from inside the skull to structures of the inner ear and face. The facial nerve continues traveling through the facial canal, eventually exiting the skull at the stylomastoid foramen. The cochlear and vestibular branches of cranial nerve VIII separate according to this schema and terminate in the inner ear. The surgeon may then coagulate and incise the tumor capsule and proceed with piecemeal tumor removal. posterior inferior - inferior vestibular area (contains inferior division of vestibular nerve) into the fundus of the internal auditory canal.posterior superior - superior vestibular area (contains superior division of vestibular nerve).anterior inferior - cochlear nerve area (contains cochlear nerve).anterior superior - facial nerve area (contains facial nerve and nervus intermedius). Although there are three osseous canals, the fundus is conceptually divided more commonly into four quadrant areas according to the four major nerve branches of the inner ear: House) then divides the upper passage into anterior and posterior sections. The falciform crest first divides the meatus into superior and inferior sections a vertical crest (Bill's bar, named by William F. The fundus is subdivided by two thin crests of bone to form three separate canals, through which course the facial and vestibulocochlear nerve branches. The lateral (outer) aspect of the canal is known as the fundus. The canal which comprises the internal auditory meatus is short (about 1 cm) and runs laterally into the bone. Internal acoustic meatus refers to a small bony foramen situated on the posterior surface of the petrous part of temporal bone, inside the posterior cranial. Its outer margins are smooth and rounded. It is located inside the posterior cranial fossa of the skull, near the center of the posterior surface of the petrous part of the temporal bone. The opening to the meatus is called the porus acusticus internus or internal acoustic opening. The internal auditory meatus (also meatus acusticus internus, internal acoustic meatus, internal auditory canal, or internal acoustic canal) is a canal within the petrous part of the temporal bone of the skull between the posterior cranial fossa and the inner ear.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |