The groove ends opposite the middle of the medial pterygoid plate. The cartilage lies in a groove between the petrous part of the temporal bone and the great wing of the sphenoid. Its apex is attached to the superior margin of the medial end of the bony part, but its base lies directly under the mucous membrane of the nasal part of the pharynx. The cartilaginous part of the auditory tube is formed of a triangular plate of elastic fibrocartilage. The opening of the bony part of the auditory tube is clearly visible on the inferior surface of the skull at the junction between the squamous and petrous parts of the temporal bone, immediately posterior to the foramen ovale and foramen spinosum. The bony part starts in the anterior wall of the tympanic cavity and is gradually getting narrower. Cartilaginous part (the remaining two-thirds).Bony part (the one-third nearest the middle ear).Protection from the influences of the nasopharyngeal environment and loud sounds.Pressure equalization on both aspects of the tympanic membrane.The main functions of the auditory tube are as following: The tube is shorter and straighter in children than in adults, so middle ear infections are more common in children. From here, the auditory tube extends forward, medially, and downward to enter the nasopharynx, opening in the lateral wall of the nasopharynx just posterior to the inferior meatus of the nasal cavity.īy joining the two structures, the auditory tube acts as a pathway for upper respiratory infection to spread into the middle ear. The opening of the auditory tube in the middle ear is located in its anterior wall. The auditory tube is 3,5-4 cm long and around 2 mm in diameter. The bony labyrinth contains the membranous labyrinth with its sensory organs responsible for hearing and balance.The auditory tube (also known as the pharyngotympanic tube, Eustachian tube, Latin: tuba auditiva) is a tunnel that connects the tympanic cavity to the nasopharynx and equalizes pressure on both sides of the tympanic membrane. The inner ear is housed in a bony labyrinth in the petrous portion of the temporal bone. The auditory ossicles are the bones that transmit and amplify air vibrations from the tympanic membrane to the inner ear. The auditory tube is a short canal that extends from the nasopharynx to the rostral portion of the tympanic cavity proper. The vestibular (oval) window is located on the dorsolateral surface of the promontory, covered by a thin diaphragm over which the footplate of the stapes is attached. The cochlear (round) window is located in the caudolateral portion of the promontory, covered by a thin membrane. On the medial wall of the tympanic cavity is the promontory, which houses the cochlea. The tympanic cavity consists of a small epitympanic recess, a large ventral bulla and the tympanic bulla proper. The tympanic membrane is a semitransparent membrane divided into the pars flaccida and pars tensa. The middle ear consists of an air-filled tympanic cavity, three auditory ossicles, and tympanic membrane. The vertical ear canal runs for about 1 inch, then forms the horizontal ear canal, which is composed of auricular and annular cartilage. The auricular cartilage of the pinna becomes funnel shaped at the opening of the external ear canal. The external ear is composed of auricular and annular cartilage. The canine ear consists of the pinna, external ear canal, middle ear and inner ear.
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