solei

so·le·us   (sō'lē-əs)    n.   pl. so·le·i (-lē-ī') A broad, flat muscle of the calf of the leg, situated under the gastrocnemius. [New Latin, from Latin solea, sandal; see sole1.]

Main Entry: so·le·us
Pronunciation: 'sO-lE-&s
Function: noun
Inflected Form: plural so·lei /-lE-"I/ also soleuses
: a broad flat muscle of the calf of the leg that lies deep to the gastrocnemius, arises from the back and upper part of the tibia and fibula and from a tendinous archbetween them, inserts by a tendon that unites with that of the gastrocnemius to form the Achilles tendon, and acts to flex the foot