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15 Questions

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Anatomy of External Auditory Meatus

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Questions and Answers

What type of glands are present in the skin of the cartilaginous part of the external auditory meatus?

Sweat glands

Mammary glands

Ceruminous (waxy) glands (correct)

Sebaceous glands

What is the lining of the external auditory meatus adherent to?

Perichondrium and periosteum (correct)

Blood vessels

Nerves

Muscles

What is the length of the external auditory (acoustic) meatus?

30 mm

24 mm (correct)

12 mm

20 mm

How far is the narrow (isthmus) of the bony part of the external auditory meatus from the eardrum?

5 mm Signup and view all the answers

Which direction is the external auditory meatus first directed towards?

Upward, backward, and medially Signup and view all the answers

What is the maximum convexity within the middle ear cavity referred to as?

Umbo Signup and view all the answers

Which nerve supplies the posterior wall and floor of the middle ear cavity?

Auricular branch of vagus Signup and view all the answers

Which artery supplies the outer surface of the middle ear cavity?

Deep auricular artery Signup and view all the answers

Which of the following is NOT one of the ossicles found in the middle ear cavity?

Cochlea Signup and view all the answers

What is the main function of the tensor tympani muscle within the middle ear cavity?

Contraction during loud sounds Signup and view all the answers

Which boundary of the middle ear cavity slopes anteriorly?

Roof Signup and view all the answers

What is the main content of the epitympanic recess within the middle ear cavity?

Air Signup and view all the answers

Which nerve forms part of the tympanic plexus within the middle ear cavity?

Chorda tympani Signup and view all the answers

What is the function of the stapedius muscle within the middle ear cavity?

Regulating sound conduction through ossicles Signup and view all the answers

Which vessels supply blood to different areas within the middle ear cavity?

Inferior tympanic vessels Signup and view all the answers