[TA] compound ligament consisting of four component ligaments that pass downward from the medial malleolus of the tibia to the tarsal bones: 1) tibionavicular ligament (pars tibionavicularis [NA]), 2) tibiocalcaneal ligament (pars tibiocalcanea [NA]), 3) anterior tibiotalar ligament (pars tibiotalaris anterior [NA]), and 4) posterior tibiotalar ligament (pars tibiotalaris posterior [NA]). SYN: ligamentum collaterale mediale [TA], deltoid ligament*, ligamentum deltoideum*, ligamentum mediale articulationis talocruralis, medial ligament of talocrural joint, tibial collateral ligament of ankle joint.