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The ultrastructure of motile cilia and flagella is described by a distinctive 9+2 arrangement of microtubules, consisting of nine doublet microtubules around a pair of single microtubules.
What contains the nine doublets of microtubules encircling a pair of single microtubules in a 9+2 arrangement?
A 9+2 microtubule skeleton, which consists of nine doublet microtubules encircling a pair of central singlet microtubules, often makes up the complex organelle known as the motile cilium.
The axoneme, a core bundle of microtubules, is a component of both flagella and motile cilia. Nine doublet microtubules make up the axoneme, which is centered on a pair of single microtubules. The 9+2 arrangement refers to the configuration of microtubules in the cross-secretion of flagella and motile cilia.
A and B tubules make up each of the nine doublet microtubules. The 9+2 microtubules are connected with additional auxiliary proteins, which give them their stiffness and elasticity.
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