In addition to loose connective tissue, fat and blood vessels, the sinus and canalis tarsi also contain the .capsules for the intertarsal joints as well as several varyingly stable tracts of fibers which present themselves in varying planes and directions but are nevertheless in a discernible arrangement to one another. This arrangement of fibers was studied on the feet of 40 adults whereby five distinct and clearly definable bundles could be regularly dissected. Starting from the lateral side and going medially, these groups of fibers can be divided into a pars lateralis, pars intermedia and pars medialis of the retinaculum mm. extensorum inferius, also a lig.talo-calcaneum obliquum and a lig. canalis tarsi. Microscopically, fibrocartilage is evidenced in the ligaments and retinacula near their points of attachment to the bone. The ligaments lying lateral to the axis of movements for the talocalcaneal joint restrain the inversion while the medially lying lig. canalis tarsi prevents the eversion.
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