Cannabaceae

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In terrestrial vertebrates, digitigrade (/ˈdɪdʒɪtɪˌɡreɪd/)[1] locomotion is walking or running on the toes (from the Latin digitus, 'finger', and gradior, 'walk'). A digitigrade animal is one that stands or walks with its toes (phalanges) on the ground, and the rest of its foot lifted. Digitigrades include birds (what many see as bird's knees are actually ankles), cats, dogs, and many other mammals, but not plantigrades (such as humans) or unguligrades (such as horses). Digitigrades generally move more quickly than other animals.

Comparison of lower limb structure. From left to right: plantigrade, digitigrade and unguligrade. In red the basipod, in violet the metapodia, in yellow the phalanges, in brown the keratin nails.

There are structural differences between the limb anatomy of plantigrades, unguligrades, and digitigrades. Digitigrade and unguligrade animals have relatively long carpals and tarsals, and the bones which correspond to the human ankle are thus set much higher in the limb than in a human. In a digitigrade animal, this effectively lengthens the foot, so much so that what are often thought of as a digitigrade animal's "hands" and "feet" correspond to only the human fingers or toes. Digitigrade locomotion is responsible for the distinctive hooked shape of dog legs.

Plantigrade animals, such as humans, normally walk with the soles of their feet on the ground. Unguligrade animals, such as horses and cattle, walk only on the distal-most tips of their digits. Digitigrade animals walk on their distal and intermediate phalanges; more than one segment of the digit makes contact with the ground, either directly (as in birds) or via paw-pads (as in dogs and cats).

Examples

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Skeleton of a wolf, showing a typical digitigrade arrangement of leg and foot bones

References

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  1. ^ "Digitigrade". Dictionary.com Unabridged (Online). n.d.
  2. ^ "APPEARANCE/ MORPHOLOGY: LEGS, SPINE AND TRACKS with literature reports for the Asian Elephant - Elephas maximus (editorial comment)". wildlifeinformation.org. Archived from the original on December 14, 2007.
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source: Https://en.wikipedia.org/wiki/Digitigrade_locomotion

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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