A Thin Filament is one of the two types of protein filaments
that, together form cylindrical structures call myofibrils and which
extend along the length of muscle fibres. (The other type of protein
filament that is found in myofibrils is called a thick
Thin filaments are formed from three proteins called actin, troponin and
tropomyosin, as shown in the labelled diagram below.
Labelled diagram of a Thin Filament.
For more advanced information about thin filaments visit: Indiana
State University .