Tarsometatarsus


Also found in: Dictionary, Medical, Wikipedia.
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 ?
Fifteen characters showed too little variation within the family--were too consistent--to be useful: Degree of ossification of the nasal septum, degree of ossification of the nasal conchs, presence or absence of a horizontal flange of the nasal septum (= floor of the nasal capsule), rostral palatines twisted or not, shape of orbital process of quadrate bone, shape of retroarticular process of mandible, completeness of rostral palate, shape of process 7b of mandible, shape of pseudotemporal process of mandible, presence or absence of a free lacrimal bone, degree of fusion of pterygoid-palatine junction, ratio of ulna length: humerus length, ratio of tibiotarsus length: tarsometatarsus length, degree of squamosal inflation, shape and size of the rostral end of the vomer.
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).
A right distal tibiotarsus and complete left tarsometatarsus (SBMNH 750) agree in all respects to bones of this species.
Radiographs showed soft tissue swelling at the right distal tarsometatarsus and digits, with a smoothly marginated periosteal reaction primarily affecting the phalanges of digit 2, best seen on the dorsoplantar projection (Fig 2).
Guthrie suggested (2002) that if differential preservation is occurring in avian fossil elements, tarsometatarsus elements would be preserved more than femur or coracoid elements.
1 mm), with foot and tibiotarsus held perpendicular to tarsometatarsus, measuring the distance between the extreme bending points (Alatalo and Lundberg, 1986).
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.
In avian species, the most common sites for pelvic limb amputation are transection of the proximal tarsometatarsus and midfemur.
04 times larger than females for wing length, culmen length, and tarsometatarsus length and approximately 1.
A separate oscillometric noninvasive blood pressure device (petMAP graphic, Ramsey Medical Inc, Tampa, FL, USA) was used with a size 8-cm cuff (cuff width approximately 40% of the circumference of the limb) placed around the right hind limb proximal to the tarsometatarsus joint.