page_title: Calcar
hierarchical_section_title: Calcar
caption_attribution_description: English: A picture illustrating the interfemoral membrane and the position of the calcar on a bat Français&#160;: Cliché monrant la membrane interfémorale et la situation du calcar d'un chiroptère
context_page_description: The calcar, also known as the calcaneum, is the name given to a spur of cartilage arising from inner side of ankle and running along part of outer interfemoral membrane in bats as well as to a similar spur on the legs of some arthropods.
  This is to help spread the interfemoral membrane, which is part of the wing membrane between the tail and the hind legs.
  Calcar also refers to the dense, vertically oriented bone present in the posteromedial region of the femoral shaft inferior to the lesser trochanter.
context_section_description: The calcar, also known as the calcaneum, is the name given to a spur of cartilage arising from inner side of ankle and running along part of outer interfemoral membrane in bats  as well as to a similar spur on the legs of some arthropods.
  This is to help spread the interfemoral membrane, which is part of the wing membrane between the tail and the hind legs. 
  Calcar (Femorale) also refers to the dense, vertically oriented bone present in the posteromedial region of the femoral shaft inferior to the lesser trochanter.
caption: A picture illustrating the location of the calcar on a bat.
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