Movements
The only movements permitted in the joints of the digits are flexion and extension; these movements are more extensive between the first and second phalanges than between the second and third.
The amount of flexion is very considerable, but extension is limited by the plantar and collateral ligaments.
Read more about this topic: Interphalangeal Articulations Of Foot
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—Thomas Aquinas (c. 1225–1274)
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—Rainer Maria Rilke (1875–1926)