The lateral radiographic image (Figs 1 and 2) revealed a soft tissue swelling around the left carpus and the radiolucency noted, consistent with a nondisplaced oblique fracture of the extensor process of the carpometacarpus.
The extensor process arises from the cranial proximal aspect of the carpometacarpus (4) and is extremely important for flight; it is the primary site for attachment of the tensor propatagialis muscle on the carpus, via the pars longus tendon.
Angel wing (AW) occurs on either or both wings of birds and affects the
carpometacarpus or the joint between the third and fourth metacarpals that twists outward away from body mostly during growth, resulting in wings resembling those of an angel (Grow, 1972; Mildred and Holderread, 1981).
Material--OMNH 74683, proximal end of right
carpometacarpus.
2012): A
carpometacarpus from the Upper Cretaceous of Patagonia sheds light on the ornithurine bird radiation.
Measurements in mm of Type of SDNHM carpometacarpus B.
This species was based on a nearly complete carpometacarpus and referred ulna and coracoids.
To illustrate, in figure 4 I have superimposed on their developmental trajectory the allometric relationship found for the tarsometatarsus (TMT) and carpometacarpus (CMC) in adults.
CMC -- Length of carpometacarpus between proximal edge of trochlea carpalis and facies articularis digitalis major.
2), and TMM 31051-25, a right wing with complete humerus, partial ulna, partial radius, and portion of
carpometacarpus (Fig.
Moreover, the ulnar carpal bone prevents the manus from hyperpronating during the downstroke by an interlocking mechanism with the
carpometacarpus and ulna; likewise, the radial carpal bone prevents the manus from hypersupinating during gliding and maneuvering by an interlocking mechanism with the
carpometacarpus and radius.
A small duck is represented by two proximal humeri, two distal coracoids and a
carpometacarpus (SBMNH 752).
