Myofibril is the name given to cylindrical structures that extend along the complete length of each muscle cell. Recall that "muscle cell" = "muscle fibre" = "muscle fiber" (Am.Sp.).

See the diagram below for further detail about the structure of myofibrils and their location within muscle cells.

Labelled diagram of a muscle cell Cell Nucleus Sarcolemma Sarcoplasm Muscle Filaments Muscle Fibre Fascicle Myofibril Striations Striations

Above: Diagram of the structure of a muscle fibre, indicating a single myofibril (top right)

Each myofibril consists of two types of protein filaments. They are thin filaments and thick filaments.

There are hundreds of myofibrils in each muscle fibre. Myofibrils line up with each other such that the Z-lines (formed from adjacent Z discs) of each sarcomere in one myofibril line up with the Z-lines of the sarcomeres in adjacent myofibrils.

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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