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.
