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|Anatomical terms of microanatomy|
In structure, they are much longer and thicker than typical microvilli, form single "finger-like" projections that may be branched, and have more of the characteristics of the cellular membrane proper. Like microvilli, they contain actin filaments and lack an axoneme, distinguishing them from cilia.
They are found in three regions of the body:
- the ductus deferens
- the epididymis (see stereocilia (epididymis) for more details). Some sources consider epididymal stereocilia to be a variant of microvilli, rather than their own distinct type of structure.
- the sensory (hair) cells of the inner ear (see stereocilia (inner ear) for more details)
Stereocilia have some basic characteristics :-
- Basal granules are absent
- May or may not be covered by a glycocalyx
- Have no fixed arrangement as is present in Kinocilium
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