The facial canal ( canalis nervi facialis), also known as the Fallopian canal, is a Z-shaped canal running through the temporal bone of the skull.Īnd check out our How to Beat 11-27 Cookie Run Kingdom guide for help with that level. It runs from the internal acoustic meatus to the stylomastoid foramen. The facial canal runs from the internal auditory meatus to the stylomastoid foramen. In humans it is approximately 3 cm long, which makes it the longest human osseous canal of a nerve. It is located within the middle ear region, according to its shape it is divided into three main segments: the labyrinthine, the tympanic, and the mastoidal segment. It contains the facial nerve (CN VII), after which it is named. The labyrinthine segment runs from the internal auditory meatus to the geniculate ganglion, superior to cochlea. Initially, it runs anterolaterally before turning sharply posterolaterally at the geniculate ganglion (first bend of the facial canal). The tympanic segment starts from the geniculate ganglion and until the second bend of the facial canal. It is closely related to the posterior and medial walls of the tympanic cavity. It lies superior to the oval window and inferior to the lateral semicircular canal. The mastoid segment starts from the second bend of the facial canal, going downwards, towards the stylomastoid foramen. The narrowest part is located at the beginning of the labyrinthine segment and midpoint of tympanic segment. The prominence of the facial canal (or prominence of the aqueduct of Fallopius) indicates the position of the bony facial canal in which the facial nerve is contained this canal traverses the medial wall of the tympanic cavity above the oval window, and behind this it curves nearly vertically downward along the posterior wall. The facial canal contains the facial nerve (CN VII), after which it is named. At the internal auditory meatus, the facial nerve together with its intermediate nerve, enters through the anterosuperior part, and the vestibulocochlear nerve enters through the posteroinferior part into the facial canal.
The facial canal may be interrupted in some people. This may lead to the facial nerve being split into 2 or 3 fibres, or it may be poorly formed or congenitally absent on one side.
The facial canal was first described by Gabriele Falloppio. This is why it may also be known as the Fallopian canal. "Postnatal development of the facial canal. ^ Weiglein AH, Anderhuber W, Jakse R, Einspieler R (1994).An investigation based on cadaver dissections and computed tomography". "Imaging of the facial canal by means of multiplanar angulated 2-D-high-resolution CT-reconstruction". "Anatomie Variations and Anomalies Involving the Facial Canal". ^ a b Shin KJ, Gil YC, Lee JY, Kim JN, Song WC, Koh KS (October 2014).Otolaryngologic Clinics of North America. "Three-dimensional study of the facial canal using microcomputed tomography for improved anatomical comprehension". "Fetal development of the tympanic part of the facial canal". Frequently asked questions on cat ear anatomy.ĭo you know cats are exceedingly sensitive to sound? Yes, their hearing range extends well above and below the human hearing.Semicircular ducts of the membranous labyrinth.Membranous labyrinth of cat’s inner ear.Bony labyrinth (osseous) of a cat’s inner ear.The tympanic cavity of a cat’s middle ear.The tympanic membrane of the middle ear.Nerve and blood supply to the external ear.European Archives of Oto-Rhino-Laryngology.
They have a keener sense of hearing than that of a dog.Įxcept for the outer part of the ear, you will find almost similar structures in the cat ear anatomy like a dog. For description, I will tell you the anatomical facts of a cat’s ear from three different regions (external, middle, and inner) separately.īut, if you want, you may learn the basic structure of a dog’s ear anatomy before going to the deep of this article. That might help you understand the main difference between the dog and cat ears. Three bones of the middle ear (ossicles).In the external part of the cat’s ear, you will find the below-mentioned structures –Īgain, the middle ear of a cat consists of the following structures – The ear structure of most mammals (including a cat) is very complicated and embedded within the petrous part of the temporal bone. You will also find the ligaments of these three ossicles in the cat’s ear. There are two small muscles present within the ossicles of the ear.
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