Comparative Study: Radio-Ulna of Frog, Varanus, Fowl, Rabbit

Codynn
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Radio-ulna of Frog

i) It is a compound bone of the fore-limb and is the component of the fore-arm.

ii) It is formed by fusion radius and ulna.

iii) The ulna projects into an olecranon process.

iv) Distal portion is somewhat flat having groove and has a articular surface for the metacarpals.

Radio- ulna of Varanus

i) They are the bones of the forearm of the fore-limb.

ii) Radius is slender and consists of a shaft and two epiphysis.

iii) Ulna is somewhat stouter lying on the outer side radius.

iv) At distal end of radius present a concave articular facet for the carpus.

Radio-ulna of Fowl

i) Radius and ulna are the bones of the forearm.

ii) Radius is slender and has a straight bone. Ulna is stouter and larger than radius and also slightly curved.

iii) Radius has a cup shaped articular surface for the trochlea of humerus and ulna has a small olecranon process and a large articular facet for the inner condyle of the humerus.

Radio-ulna of Rabbit

i) They are the bones of the fore-arm or fore-limb.

ii) Both the bones are almost equal in size, slender & curved.

iii) Radius is elongated and slightly curved forward.

iv) Ulna is longer than radius.

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