The digit, d1, which stands as hallux is fully formed and has three phalanges.
Three of the rings and three phalanges are shown in plate 14.
It has only two phalanges, while each of the other digits has three.
The other digits, of which the third is the longest, have each three phalanges.
In Swifts the third and fourth toes have only three phalanges.
The index finger has three phalanges, and is usually clawed.
The middle finger has two phalanges, but the index is rudimentary.
In them not only is the metacarpus turned back, but also the two first phalanges.
Such also exist at the articulations of the second and third phalanges.
As the name indicates, this muscle extends the phalanges, one upon the other.