Final answer:
The medial bulge at the ankle is called the medial malleolus, which is a projection from the tibia, providing stability and movement to the ankle joint.
Step-by-step explanation:
The medial bulge at your ankle is known as the medial malleolus, which is a projection from the tibia. The medial malleolus is a significant bony structure on the inner part of the ankle, forming part of the ankle joint by articulating with the talus bone of the foot.
This bony prominence is quite evident when you look at your ankle and serves as a key structure contributing to the stability and movement of the ankle joint. On the other hand, the lateral malleolus, which is the bony bump on the outer part of the ankle, is a projection of the fibula. The tibia's medial malleolus and the fibula's lateral malleolus both provide attachment points for ligaments and articulate with the talus to facilitate ankle movements.