PHARYNGEAL CLEFTS – ECTODERMAL DERIVATIVES

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5 Terms

1
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How many pharyngeal clefts are there, and which one contributes to definitive structures?

Four pairs of pharyngeal clefts
Only the first cleft contributes to permanent structures

2
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What does the first pharyngeal cleft form?

External auditory meatus (lined by ectoderm)

3
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What happens to the 2nd, 3rd, and 4th clefts?

Overgrown by the proliferating 2nd pharyngeal arch
Forms a temporary cervical sinus, which usually disappears

4
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What is a branchial fistula?

  • Abnormal canal connecting pharynx or skin due to failure of fusion of 2nd arch with epicardial ridge

  • Can be external, internal, or both

5
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What is a lateral cervical cyst?

  • Remnant of the cervical sinus

  • Located along the anterior border of the sternocleidomastoid muscle