Malleolar sulcus
Encyclopedia
There are two malleolar sulci, medial and lateral.

The medial malleolar sulcus is the posto-inferior groove just lateral to the medial malleolus on the distal part of the tibia
Tibia
The tibia , shinbone, or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates , and connects the knee with the ankle bones....

. It is where the tendons of the tibialis posterior and flexor digitorum longus course on their way to their insertions on the foot.

The lateral malleolar sulcus is the posto-inferior groove on the distal part of the fibula. The tendons of the peroneus longus and peroneus brevis course behind it on the way to their insertions on the foot.
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