|
 |
Internally, a muscle fiber has lengthwise
myofibrils, each composed of a series of segments called sarcomeres.
Each sarcomere contains many lengthwise myofilaments. The two types
of myofilaments (thick & thin) occur in a regular arrangement which
causes the cross striations (alternating dark and light bands) to be
seen in myofibrils and fibers. These bands are readily seen in the
image to the left.
|
See
this slide with the virtual
microscope