Here's how it breaks down:
* metatars/o- - refers to the metatarsals, which are the five long bones in the foot between the ankle and toes.
You can see this combining form used in various medical terms related to the metatarsals, such as:
* Metatarsalgia - pain in the metatarsals
* Metatarsal fracture - a break in one of the metatarsal bones
* Metatarsophalangeal joint - the joint between the metatarsal bones and the phalanges (toe bones)
* Metatarsus adductus - a condition where the metatarsals are turned inward