14.1 POJA-L6048 Electron micrograph of a sarcomere of the striated muscle (mouse)
Electron micrograph of details of a sarcomere of the striated muscle (mouse)
Title: Electron micrograph of details of a sarcomere of the striated muscle (mouse)
The electron micrograph shows the myosin and actin filaments, and dispersed between them mitochondria, ribosomes and the darker stained glycogen granules.
(Z) indicates the thick Z-line perpendicular to the thin green bar (I-band).
The long thin red bar (A-band) is perpendicular to the H-band with its central M-lines.
The smallest blue bar marks the H-band with M-lines. Note that several M-lines are perpendicular to the A-band (rectangle frame).
In the middle of the H-band thin M-line proteins comprise the myosin-binding proteins myomesin, M-protein, obscurin and a muscle creatine phosphatase. These proteins are involved in holding the myosin filaments in register in this region and are responsible for the attachment of titin molecules to myosin filaments.
Keywords/Mesh: locomotor system, skeletal muscle, striated muscle, A-band, H-band, M-line, I-band, Z-line, electron microscopy, POJA collection