In the gastrosoleus complex, which zone contains the myotendinous junction?

In the gastrosoleus complex, which zone contains the myotendinous junction?

• A. Zone 1
• B. Zone 3
• C. Zone 4
• D. Zone 2

Answer: (D)

The myotendinous junction is the transition point where contractile muscle fibers become the tendon that transmits force to the Achilles. In the gastrosoleus complex, this interface sits in Zone 2, the musculotendinous junction. This zone specifically marks where muscle blends into tendon, not the muscle belly or the distal tendon/insertion. So Zone 2 is the site of the MTJ, while zones describing the muscle belly (earlier regions) or the tendon proper/insertion (later regions) do not contain the MTJ.

The myotendinous junction is the transition point where contractile muscle fibers become the tendon that transmits force to the Achilles. In the gastrosoleus complex, this interface sits in Zone 2, the musculotendinous junction. This zone specifically marks where muscle blends into tendon, not the muscle belly or the distal tendon/insertion. So Zone 2 is the site of the MTJ, while zones describing the muscle belly (earlier regions) or the tendon proper/insertion (later regions) do not contain the MTJ.