Which statement best describes zone 1, zone 2, zone 3 mapping in the gastrosoleus complex?

• A. Zone 1 is gastroc muscle belly; Zone 2 is myotendinous junction; Zone 3 is Achilles tendon
• B. Zone 1 is gastrocnemius tendon; Zone 2 is soleus muscle belly; Zone 3 is tibial nerve
• C. Zone 1 is Achilles tendon; Zone 2 is gastroc muscle belly; Zone 3 is myotendinous junction
• D. Zone 1 is plantaris tendon; Zone 2 is Achilles tendon; Zone 3 is plantar fascia

Answer: (A)

Understanding how the gastrosoleus complex is arranged from proximal to distal helps you localize injuries along the muscle–tendon unit. The first region is the gastrocnemius muscle belly (zone 1). Moving distally, the next section is the myotendinous junction, where muscle fibers transition into tendon (zone 2). Further distal is the Achilles tendon itself (zone 3). This sequence matches how the gastrosoleus is organized and why zone 1 corresponds to the muscle belly, zone 2 to the myotendinous junction, and zone 3 to the Achilles tendon. The other mappings mix tissue types (for example, placing a tendon first or identifying a nerve as a zone), which doesn’t reflect the actual anatomy of the gastrosoleus complex.