Podcast
Questions and Answers
What is the angle made by the tympanic membrane with the floor of the external auditory meatus?
What is the angle made by the tympanic membrane with the floor of the external auditory meatus?
Which artery's tympanic branch enters the middle ear cavity through the petrotympanic fissure?
Which artery's tympanic branch enters the middle ear cavity through the petrotympanic fissure?
What structure drains the veins of the middle ear?
What structure drains the veins of the middle ear?
What is the structure that equalizes pressure on either side of the tympanic membrane?
What is the structure that equalizes pressure on either side of the tympanic membrane?
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Which nerve supplies the middle ear?
Which nerve supplies the middle ear?
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What is the structure that separates the tympanic cavity from the middle cranial fossa?
What is the structure that separates the tympanic cavity from the middle cranial fossa?
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Which part of the lateral wall is formed by the squamous part of the temporal bone?
Which part of the lateral wall is formed by the squamous part of the temporal bone?
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Which structure emerges from the apex of the pyramid in the tympanic cavity?
Which structure emerges from the apex of the pyramid in the tympanic cavity?
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What is located below the aditus to the mastoid antrum in the posterior wall of the tympanic cavity?
What is located below the aditus to the mastoid antrum in the posterior wall of the tympanic cavity?
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What may replace the bony floor separating the tympanic cavity from the superior bulb of the internal jugular vein?
What may replace the bony floor separating the tympanic cavity from the superior bulb of the internal jugular vein?
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Study Notes
Middle Ear Anatomy
- The tympanic membrane makes an angle of 45 degrees with the floor of the external auditory meatus.
Blood Supply
- The tympanic branch of the middle meningeal artery enters the middle ear cavity through the petrotympanic fissure.
Venous Drainage
- The superior petrosal sinus drains the veins of the middle ear.
Pressure Regulation
- The Eustachian tube equalizes pressure on either side of the tympanic membrane.
Nerve Supply
- The tympanic branch of the glossopharyngeal nerve (CN IX) supplies the middle ear.
Tympanic Cavity Boundaries
- The tegmen tympani separates the tympanic cavity from the middle cranial fossa.
- The lateral wall of the tympanic cavity is formed by the squamous part of the temporal bone.
Tympanic Cavity Structures
- The tendon of the tensor tympani muscle emerges from the apex of the pyramid in the tympanic cavity.
Posterior Wall Structures
- The antrum of the mastoid process is located below the aditus to the mastoid antrum in the posterior wall of the tympanic cavity.
Bony Floor Variations
- The bony floor separating the tympanic cavity from the superior bulb of the internal jugular vein may be replaced by a thin plate of bone or a fibrous Bridge.
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Description
Explore the anatomy of the middle ear tympanic cavity, located inside the petrous part of the temporal bone. Learn about its boundaries, including the roof, floor, and walls, as well as its structures like the epitympanic recess and mucous membrane lining.
