No sub-articles
Browse articles in this level »
旁边的新文章keletal Muscle Architecture New article below Skeletal Muscle Architecture

The skeletal muscle is composed of bundles (fascicles) of muscle fibers grouped together.

In both skeletal and cardiac muscle cells, the interior of a muscle cell is filled withmyofibrils, which are filaments containing the contractile proteins.

The contractile proteins are arranged in units known assarcomeres, which is what gives these muscle types their "striated appearance."

The cross section of muscle consists of many tiny red tubes, called myofibrils, parallelly aligned inside a bigger red tube, called muscle fiber, that has blue spheres adhered to its outer surface. Those muscle fiber tubes are also aligned inside a bigger bundle caled muscle fascicle, or cell bundle, with similar blue spheres on its outer surface. Those cell bundles are, again, aligned together into final muscle. Inside the muscle, in between those bundles of cells, arteries, veins, and nerves are placed along. The close view of the myofibril represents a cylindrical structure that consists of alternately arranged Z line and M line. Two Z lines and one M line in the middle create a sarcomere - basic contractile unit of muscle fiber.

Figure 1:The architecture of a skeletal muscle

Baidu