Pseudostratified Epithelium · Histology

The '9+2' axoneme arrangement refers to:

  1. 9 peripheral doublets and 2 central microtubules
  2. 9 microvilli surrounding 2 cilia
  3. 9 parallel actin filaments with 2 central myosin filaments
  4. 9 basal bodies and 2 nuclei
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Correct answer: 9 peripheral doublets and 2 central microtubules

The 9+2 arrangement is the internal structural framework of motile cilia. It consists of nine microtubule doublets arranged in a circle around two central singlet microtubules.

Difficulty: Medium Question 19 of 20

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