External Ear Anatomy Quiz

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Questions and Answers

What is the function of the wax in the ear canal?

Prevent foreign objects from entering the ear canal, absorb excess moisture, and prevent bacterial growth
Provide nutrients to the ear canal, repel insects, and discourage fungal growth
Act as a cushion for the eardrum, regulate air pressure, and protect the ear canal from temperature changes
Repel water, trap dust and micro-organisms, moisturize epithelium, and possess antibacterial properties (correct)

Which structure is located in front and below the external auditory canal?

Temporomandibular joint
Mastoid air cells
Parotid gland (correct)
Middle cranial fossa

From where does the auricle develop?

6 mesenchymal tubercles from the 1st&2nd branchial clefts (correct)
Endoderm of the 2nd branchial cleft
Mesoderm of the 3rd branchial cleft
Ectoderm of the 1st branchial cleft

What is the significance of the tympanic sulcus and tympanic annulus?

<p>Constriction points in the external ear canal (C)</p> Signup and view all the answers

What is the composition of ear wax?

<p>Amino acids, fatty acids, lysozymes, and immunoglobulins (D)</p> Signup and view all the answers

Flashcards

Ear wax function

Ear wax protects the ear by repelling water, trapping dust and germs, moisturizing the ear lining, and having antibacterial properties.

Structure in front/below ear canal

The parotid gland is in front and below the ear canal.

Auricle development

The outer ear (auricle) forms from six embryonic tissues (mesenchymal tubercles) near the first and second throat grooves.

Tympanic sulcus/annulus

The tympanic sulcus and annulus are constrictions in the ear canal that provide structure.

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Ear wax composition

Ear wax has amino acids, fatty acids, enzymes (lysozymes), and antibodies (immunoglobulins).

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Study Notes

What is the function of the wax in the ear canal? Which structure is located in front and below the external auditory canal? From where does the auricle develop? What is the significance of the tympanic sulcus and tympanic annulus? What is the composition of ear wax?