11/19/2025
Which gastrocnemius is not like the other? We believe a small tear occurred in the outer most layer of the muscle, known as the epimysium. The layers of tissue surrounding a muscle are epimysium, perimysium, and endomysium, which are all types of connective tissue that provide structure, support, and compartmentalize the muscle fibers. The epimysium wraps the entire muscle, the perimysium encloses bundles of muscle fibers called fascicles, and the endomysium surrounds each individual muscle fiber.