tibialis
noun
tib·i·a·lis
| \ ˌtib-ē-ˈā-ləs
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plural tibiales\ -(ˌ)lēz
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Medical Definition of tibialis
: either of two muscles of the calf of the leg:
a
: a muscle arising chiefly from the lateral condyle and part of the shaft of the tibia, inserting by a long tendon into the first cuneiform and first metatarsal bones, and acting to flex the foot dorsally and to invert it
— called also tibialis anterior, tibialis anticus
b
: a deeply situated muscle that arises from the tibia and fibula, interosseous membrane, and intermuscular septa, that is inserted by a tendon passing under the medial malleolus into the navicular and first cuneiform bones, and that flexes the foot in the direction of the sole and tends to invert it
— called also tibialis posterior, tibialis posticus