"origin:"
"insertion: calcaneal (Achilles) tendon into mid-posterior calcaneus"
"action: plantar flexes the foot and flexes the knee"
"arterial supply: sural arteries"
"innervation: tibial nerve (sciatic nerve roots S1 and S2)"
"antagonist: tibialis anterior"
"key relationships"
"Achilles tendon tear"
"Achilles tendonitis"