Thin Filament

A thin filament is one of the two types of protein filaments that, together form cylindrical structures call myofibrils which extend along the length of muscle fibres. The other type of protein filament that is found in myofibrils is called a thick filament.

Thin filaments are formed from three proteins called actin, troponin and tropomyosin, as shown in the labelled diagram below.

Above: Labelled diagram of a thin filament


See more aboutalso the structures of muscle filaments.


This section consists of short summaries about the structures that form the muscles of the body. This list is not exhaustive but is intended to be appropriate for students of A-Level Human Biology, ITEC courses in massage and related subjects, and other courses in health sciences. For more general information about muscles see the pages about:

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