neural arch वाक्य
उदाहरण वाक्य
मोबाइल
- In primitive forms the basioccipital and exoccipitals somewhat resemble the centrum and neural arches of a vertebra, and form in a similar manner in the embryo.
- They had anteriorly placed neural arches, expanded distal blades, irregularly shaped coracoids, and ventral triangular projections on the anterior ramus of their quadratojugal bones.
- These restrict the range of movement possible, and are joined by a thin portion of the neural arch called the " pars interarticularis ".
- The pneumatic openings, the entrance holes for the air sacks, at the sides of the neural arch are small and placed in a low position.
- Relative to other early tetrapods ( labyrinthodonts ), they had simplified backbones, where the whole vertebra was made of a single intercentrum, topped by a neural arch.
- RSM P2414.1 appears to represent an adult, because the neural arches are fused to their vertebrae, although incomplete fusion elsewhere indicates it was a young adult.
- Other vertebral material includes seven centra that are fragmentary and a few neural arches, which are unattached . 12 dorsal ribs are preserved, as well as some appendicular elements.
- The autapomorphy ( unique trait ) is the presence of dorsoventrally tall neural arch restricted to anterior half of centrum ( excluding condylar ball ) in anterior-most caudal vertebrae.
- The tail is tall near its base due to high neural arches above the vertebrae and long sacral and caudal ribs restricted lateral movement, making most of the tail inflexible.
- Forward displacement of a proximal vertebra in relation to its adjacent vertebra in association with an intact neural arch, and in the presence of degenerative changes is known as degenerative spondylolisthesis.
- However, it is thought that none of these specimens are of fully mature animals as poor bone ossification is present and the neural arches are paired and disarticulated from the pleurocentra.
- Group Y is diagnosed by the presence of four or more sacral vertebrae with fully fused neural arches, which is also seen in theropod dinosaurs ( a case of evolutionary convergence ).
- Transverse sections through the first neural of A . " Aspideretes hurum " showing the suture between the wide neural bone ( N ) and the vertebral neural arch ( V ).
- In " Dicraeosaurus ", this air sac ( the so-called supravertebral diverticulum ) would have rested on top of the neural arch and filled the entire space between the spines.
- Most specimens of " Fruitachampsa " probably belong to adult individuals because the neural arch is fused to the body of each vertebra, and the sacral ribs are fused to the sacrum.
- Naish also pointed out that Owen had noted the large depressions on the neural arch sides and had explained them as a result of pneumatisation, the first time this phenomenon would explicitly have been observed with a dinosaur.
- In addition, the anterior and posterior boundaries of these neural spines have distinct ridges ( pre-and postspinal laminae ) connecting them to the pre-and postzygapophyses ( the articulation points of the neural arches ).
- Even though none of the neural arches are fused to their centra in the vertebral column of both individuals ( a possible juvenile trait ), this feature is present in all large pliosaurids, and thus possibly paedomorphic within Pliosauridae.
- In hupehsuchians, where the neural arches dominate the vertebral column, the height of the centra is reduced and the height to length ratio of the centra is smaller, meaning that they are also about as long as they are high.
- ""'Kelyophis " "'(; meaning'small serpent'from the tubercular-shaped neural spines that are directed toward the back of the neural arches, and several other features of the vertebrae.
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