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Myofibril is the name given to one of the components
of skeletal muscle cells that are particular to muscle tissue.
These are cylindrical structures that extend along
the complete length of the muscle
fibre/cell (illustrated below).
Above: Diagram of the Structure of a Muscle Fibre, indicating a single
Myofibril (top right).
Each myofibril consists of two types of protein filaments called thick
filaments, and thin
filaments. There are hundreds of myofibrils in each
muscle fibre. Adjacent myofibrils
line up with each other such that the Z-lines (formed from adjacent
Z-discs) of each sarcomere in one myofibril lines 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 some other courses in Health Sciences.
For more general information about Muscles see
the pages about: Anterior
Muscles, Posterior
Muscles, Facial
Muscles, Terminology
about Muscles, and the Structure
of Muscles. |
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