15 Questions
What type of glands are present in the skin of the cartilaginous part of the external auditory meatus?
Ceruminous (waxy) glands
What is the lining of the external auditory meatus adherent to?
Perichondrium and periosteum
What is the length of the external auditory (acoustic) meatus?
24 mm
How far is the narrow (isthmus) of the bony part of the external auditory meatus from the eardrum?
5 mm
Which direction is the external auditory meatus first directed towards?
Upward, backward, and medially
What is the maximum convexity within the middle ear cavity referred to as?
Umbo
Which nerve supplies the posterior wall and floor of the middle ear cavity?
Auricular branch of vagus
Which artery supplies the outer surface of the middle ear cavity?
Deep auricular artery
Which of the following is NOT one of the ossicles found in the middle ear cavity?
Cochlea
What is the main function of the tensor tympani muscle within the middle ear cavity?
Contraction during loud sounds
Which boundary of the middle ear cavity slopes anteriorly?
Roof
What is the main content of the epitympanic recess within the middle ear cavity?
Air
Which nerve forms part of the tympanic plexus within the middle ear cavity?
Chorda tympani
What is the function of the stapedius muscle within the middle ear cavity?
Regulating sound conduction through ossicles
Which vessels supply blood to different areas within the middle ear cavity?
Inferior tympanic vessels
Learn about the anatomy of the external auditory meatus, including its length, composition, and lining. Understand the differences between the cartilaginous and bony parts of the ear canal.
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