eo, Opisthotic. prp, Pterygoid process of sphe eu, Eustachian tube.
eu, Eustachian tube.
3.) The middle ear communicates with the mouth by the Eustachian tubes, which pass between the basisphenoid and basioccipital bones, and unite upon the ventral side of the sphenoid, a little behind its articulation with the pterygoids, where they open into the mouth cavity by a short membranous duct.
Here may be mentioned the guttural pouches, large airsacs from the Eustachian tubes, and lying behind the upper part of the pharynx, the function of which is also not understood.
Aglossa, - Eustachian tubes united into a single ostium pharyngeum; no tongue.
Phaneroglossa, - Eustachian tubes separated; tongue present.
Close to the front opening of the Eustachian tubes are masses of tissue called adenoids.
It can be caused by excess ear wax, blocked eustachian tubes, pressure damage or aging.
They contribute to the formation of the auditory meatus, and of the right and left carotid canals which accompany the eustachian tubes.
The basi-pterygoids (bpg) are mere knobs, and the common eustachian opening is seen between them.
It includes the eardrum, the three little bones (hammer, anvil, and stirrup) that transmit sound to the inner ear, and the eustachian tube, which connects the inner ear to the nasopharynx (the back of the nose).
The middle ear is connected to the nose by the eustachian tube, a narrow channel that runs from the eardrum to the back of the throat.
Infection usually stems from an upper respiratory infection in which swelling (edema) in the eustachian tube causes fluid and mucous to gather behind the eardrum.
Eustachian tube-A thin tube between the middle ear and the pharnyx.
Children develop otitis media because the eustachian tubes that connect the middle ear with the back of the mouth and equalize air pressure and drain fluid are small and easily obstructed.
Acute otitis media can result from a respiratory infection such as a cold that causes an inflammation that blocks a eustachian tube.
As a child grows the eustachian tubes widen and stiffen, allowing air to enter and fluid to drain from the middle ear more efficiently.
It may be that pacifier use spreads infection or that intense sucking on pacifiers hinders proper functioning of the eustachian tube that normally keeps the middle ear open and clean.
Sinus swelling can constrict a child's eustachian tube that connects the inner ear to the throat, causing a congested feeling and "ear popping."
The eustachian tube, which connects the middle ear to the nose, normally equalizes pressure in the middle ear, allowing the eardrum and ossicles to vibrate correctly, so that hearing is normal.
In children, the eustachian tube is shorter and less slanted than in adults.
Children also have clumps of infection fighting cells, commonly called adenoids, in the area of the eustachian tube.
These adenoids may enlarge with repeated respiratory tract infections and ultimately block the eustachian tubes.
Acute otitis media often occurs as an aftereffect of upper respiratory infections, in which the eustachian tube and nasal membranes become swollen and congested.
It is often associated with an abnormal or malfunctioning eustachian tube, which causes negative pressure in the middle ear and leaking of fluid from tiny blood vessels, or capillaries, into the middle ear.
The position the child is in while breastfeeding is better than the usual bottle-feeding position for optimal eustachian tube function.
Because they encircle the only connection between the middle ear and the eustachian tube, hypertrophied adenoids can also obstruct the tube and cause middle ear infections.
Keeping the eustachian tubes open is an important contribution to optimal function in the tonsils and adenoids.
The common cold, also called a rhinovirus or coronavirus infection, is a viral infection of the upper respiratory system, including the nose, throat, sinuses, eustachian tubes, trachea, larynx, and bronchial tubes.
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