Tarsometatarsus


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Related to Tarsometatarsus: Pygostyle, tibiotarsus

Tarsometatarsus

 

a bone in birds located between the ti bia and the toes. The tarsometatarsus is formed by the concrescence of the third tarsal bone with the three middle (second through fourth) metatarsal bones that are concresced lengthwise. In Archeopteryx the metatarsal bones were free. In some adult extant birds, for example, penguins and frigate birds, the tarsometatarsus has traces of concrescence—openings and little grooves between the metatarsal bones. The length of the tarsometatarsus differs in different species of birds; for example, in climbing parrots it is very short, and in marsh birds it is the same length as the long tibias. The males of some Galliformes have a spur on the dorsal side of the tarsometatarsus. The fossils of giant reptiles (predatory dinosaurs), whose legs reveal a convergent resemblance to the legs of birds, also had a tarsometatarsus similar to that of birds.

References in periodicals archive ?
Compared with the initial radiographs, there was slight overall shortening of the tarsometatarsus (Fig ID).
The relationships between the length of the lower leg with respect to the length of the femur, and the length of the proximal (tibia or tibiotarsus) to distal bones (metatarsus or tarsometatarsus) of the lower leg standardized by the length of the femur were established in order to determine similarities and differences in structural proportions between the hindlimbs in these groups.
One technique has been previously described for the intertarsal joint in which application of a polyester fiber suture through mediolaterally oriented intraosseous tunnels at the tibiotarsus and tarsometatarsus was performed followed by tying of the ends of the suture together so that the implant encircled the joint along the frontal plane [1].
Material: SDNHM 50664, right distal humerus; 51595, fragmentary left humerus; 50660, left humerus; 50686 right humerus; 51600 left ulna; 50667, proximal right ulna; 50674, distal right ulna; 51608, left carpometacarpus; 51606, left coracoid; 51611, left scapula; 50666 distal left tarsometatarsus; 50669, synsacrum; 50680, claw; 51623, 3 phalanges
Proximal end anda shaft of tarsometatarsus, pedal phalanx (Tera-124-126).
Of these, nine were too inconsistent within species to be useful: Shape of the lateral margin of the ectethmoid plate, size of the supraotic fenestra, relative lengths of the metatarsal trochleae, shape of the maxillopalatine bones, shape of the internal (= medial) process of the mandible, presence and nature of the Pocock foramina (Pocock 1966), the degree of the distal bend of the tarsometatarsus, degree of the medial curve of the rostral palatine, and presence and shape of a manubrium-sternum bridge.
(B) Partial correlations and power of the test relating the number of young alive to brood size, fledging date and average nestling mass, and ninth primary, tarsometatarsus, and bill lengths after controlling for the effects of brood size (cost hypothesis) or the combination of clutch size and the second-order polynomial of brood size (optimization hypothesis).
Despite quantitative differences in morphology among island and mainland populations, mass, wing chord, and tarsometatarsus lengths for all populations fell within the range of values reported by Wheelwright and Rising (1993) for "typical" Savannah sparrows (Table 1).
The edema is mostly lateralized, as observed in the dorsoventral image, and extended from the distal phalanx to the distal tarsometatarsus. Signs of osseous remodeling are not noted.
Skeletal specimens were prepared, and a total of 25 linear measurements of the ulna, humerus, femur, tibiotarsus and tarsometatarsus were selected (Table I).
A wing bone of the giant extinct penguin along with a 9.1 centimetre long tarsometatarsus, which would have been formed by the fusion of ankle and foot bones, were discovered by Carolina Acosta Hospitaleche from the La Plata Museum in Argentina.
Loye Miller (1931) referred a proximal left tarsometatarsus in the LACM collection to Chen, but did not identify the specimen to species.