Anatomy Of External Auditory Canal

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| By Drtbalu

Drtbalu

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Quizzes Created: 2 | Total Attempts: 1,419

Questions: 9 | Attempts: 528 | Updated: Mar 21, 2023

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This quiz is on the topic "Anatomy of external auditory canal. Please read up the topic from here.

Questions and Answers

1.

Which of the following are features of external auditory canal?
- A.
  
  It is the only skin lined culdesac in the entire human body
- B.
  
  It performs both auditory and non auditory functions
- C.
  
  Performs auditory function only
- D.
  
  This canal is self cleansing in nature
Correct Answer(s)
A. It is the only skin lined culdesac in the entire human body
B. It performs both auditory and non auditory functions
D. This canal is self cleansing in nature

Explanation
The external auditory canal is the only skin lined culdesac in the entire human body. It performs both auditory and non-auditory functions, such as protecting the middle and inner ear from foreign objects and regulating pressure. Additionally, the canal is self-cleansing in nature, as it produces cerumen (earwax) to trap dust and debris and moves it out of the ear.

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2.

The external auditory canal develops from the ____________.
- A.
  
  First branchial cleft
- B.
  
  Second branchial cleft
- C.
  
  Third branchial cleft
- D.
  
  Fourth branchial cleft
Correct Answer
A. First branchial cleft

Explanation
The external auditory canal develops from the first branchial cleft. During embryonic development, the first branchial cleft forms a groove that deepens and eventually becomes the external auditory canal. This canal connects the outer ear to the middle ear and allows sound waves to travel into the ear. The first branchial cleft also gives rise to other structures in the head and neck region, such as the external ear and certain parts of the face.

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3.

Embryological Primary meatus corresponds to
- A.
  
  Medial third of external auditory canal
- B.
  
  Complete external auditory canal
- C.
  
  Lateral third of external auditory canal
- D.
  
  Medial half of external auditory canal
Correct Answer
C. Lateral third of external auditory canal

Explanation
The embryological primary meatus corresponds to the lateral third of the external auditory canal. This means that during embryonic development, the external auditory canal is formed from the lateral third of the primary meatus. The primary meatus is a groove-like structure that develops in the embryo and eventually gives rise to the external auditory canal. Therefore, the correct answer is the lateral third of the external auditory canal.

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4.

External auditory canal is fully canalized by
- A.
  
  Third week of gestation
- B.
  
  12th week of gestation
- C.
  
  18 weeks of gestation
- D.
  
  28th week of gestation
Correct Answer
D. 28th week of gestation

Explanation
The external auditory canal is fully canalized by the 28th week of gestation. This means that by this time, the auditory canal has formed and is open, allowing sound waves to enter the ear. The development of the auditory canal is a gradual process that occurs during fetal development, starting around the third week of gestation. By the 28th week, the canal is fully formed and ready to function.

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5.

Foramen Huschke is seen
- A.
  
  In the floor of external auditory canal
- B.
  
  Antero inferior portion of bony external auditory canal
- C.
  
  Roof of the external auditory canal
- D.
  
  Posterior wall of external auditory canal
Correct Answer
B. Antero inferior portion of bony external auditory canal

Explanation
Foramen Huschke is seen in the antero inferior portion of the bony external auditory canal. This is a small opening that can be found in the front and lower part of the canal. It is named after Johann Friedrich Huschke, a German anatomist who first described it. The foramen Huschke is important because it can potentially lead to complications such as cholesteatoma, a type of abnormal skin growth in the middle ear.

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6.

Features of infant external auditory canal include
- A.
  
  At birth tympanic membrane and ossicles are of adult size
- B.
  
  Tympanic membrane and squamous portion of temporal bone forms the roof of external canal
- C.
  
  Tympanic rim is fused completely inferiorly
- D.
  
  The shape of the external canal in a neonate is nearly straight
Correct Answer(s)
A. At birth tympanic membrane and ossicles are of adult size
B. Tympanic membrane and squamous portion of temporal bone forms the roof of external canal
D. The shape of the external canal in a neonate is nearly straight

Explanation
The features of the infant external auditory canal include the fact that at birth, the tympanic membrane and ossicles are of adult size. Additionally, the tympanic membrane and squamous portion of the temporal bone form the roof of the external canal. Furthermore, the shape of the external canal in a neonate is nearly straight.

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7.

The adult external auditory canal measures about
- A.
  
  5 cms
- B.
  
  8 cms
- C.
  
  1 cm
- D.
  
  2.5 cms
Correct Answer
D. 2.5 cms

Explanation
The adult external auditory canal measures about 2.5 cms. This measurement refers to the length of the canal, which is the passage that leads from the outer ear to the middle ear. It is important for the canal to have an appropriate length to ensure the proper transmission of sound waves. If the canal is too short or too long, it can affect the way sound is conducted and perceived by the individual. Therefore, a length of 2.5 cms is considered to be within the normal range for an adult's external auditory canal.

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8.

The following are anatomical features of external auditory canal
- A.
  
  It is divided into outer cartilagenous and inner bony portions
- B.
  
  Outer 2/3 is cartilagenous and inner 1/3 is bony
- C.
  
  Outer 1/3 is cartilagenous and inner 2/3 is bony
- D.
  
  Antero inferior wall is slightly longer than postero superior wall
- E.
  
  Bony canal is directed antero inferiorly
Correct Answer(s)
A. It is divided into outer cartilagenous and inner bony portions
C. Outer 1/3 is cartilagenous and inner 2/3 is bony
D. Antero inferior wall is slightly longer than postero superior wall
E. Bony canal is directed antero inferiorly

Explanation
The external auditory canal is divided into two portions, with the outer two-thirds being cartilaginous and the inner one-third being bony. The antero-inferior wall of the canal is slightly longer than the postero-superior wall. Additionally, the bony canal is directed antero-inferiorly.

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9.

Narrowest portion of external canal is at its bony cartilagenous junction
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because the narrowest portion of the external canal is indeed at its bony cartilaginous junction. This junction is where the bony part of the ear canal meets the cartilaginous part, and it is the narrowest point in the entire external canal. This narrowness helps to protect the ear from foreign objects and restricts the entry of large objects into the ear canal.

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Anatomy Of External Auditory Canal

Which of the following are features of external auditory canal?

The external auditory canal develops from the ____________.

Embryological Primary meatus corresponds to

External auditory canal is fully canalized by

Foramen Huschke is seen

Features of infant external auditory canal include

The adult external auditory canal measures about

The following are anatomical features of external auditory canal

Narrowest portion of external canal is at its bony cartilagenous junction