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4 results for “Struthio camelus”
Explanation of Plate I. Figure 1.—Left tibia of Ornithomimus velox, Marsh; A, front view; b, distal end; c, transverse section. Figure 2.—Left metatarsals of same specimen; A, front view; b, proximal ends; c, transverse section; d, distal ends. Figure 3.—Phalanges of second digit of same foot; front view, a, first phalange; b, second phalange; c, third, or terminal phalange. Figure 4.—Left metacarpals of same species, perhaps of smaller individual; front view. Figure 5.—Left tibia of young Ostrich (Struthio camelus, Linn.); a, front view; b, distal end. The separate calcaneum was first observed by the writer's assistant, Dr. G-. Baur, who prepared the specimen. Figure 6.—Left metatarsals of young turkey (Meleagris gallipavo, Linn.); a, front view; b, proximal ends. a, astragalus; as, ascending process of astragalus; c, calcaneum; f, fibula; f' face for fibula; II, second metatarsal; III, third metatarsal; iv, fourth metatarsal. Figures 1-4 are one-third natural size, and figures 5 and 6, one-half natural size. in Description of new dinosaurian reptiles
Explanation of Plate I. Figure 1.—Left tibia of Ornithomimus velox, Marsh; A, front view; b, distal end; c, transverse section. Figure 2.—Left metatarsals of same specimen; A, front view; b, proximal ends; c, transverse section; d, distal ends. Figure 3.—Phalanges of second digit of same foot; front view, a, first phalange; b, second phalange; c, third, or terminal phalange. Figure 4.—Left metacarpals of same species, perhaps of smaller individual; front view. Figure 5.—Left tibia of young Ostrich (Struthio camelus, Linn.); a, front view; b, distal end. The separate calcaneum was first observed by the writer's assistant, Dr. G-. Baur, who prepared the specimen. Figure 6.—Left metatarsals of young turkey (Meleagris gallipavo, Linn.); a, front view; b, proximal ends. a, astragalus; as, ascending process of astragalus; c, calcaneum; f, fibula; f' face for fibula; II, second metatarsal; III, third metatarsal; iv, fourth metatarsal. Figures 1-4 are one-third natural size, and figures 5 and 6, one-half natural size.
Magnetic Resonance Imaging Scan of the Brain of a Ostrich (Struthio camelus)
<p>Magnetic Resonance Imaging Scan of the Brain of a Ostrich (<i>Struthio camelus</i>) from http://braincatalogue.org/Ostrich</p>
Anatomy, ontogeny, and evolution of the archosaurian respiratory system: a case study on Alligator mississippiensis and Struthio camelus
<p>The avian lung is highly specialized and is both functionally and morphologically distinct from that of their closest extant relatives, the crocodilians. It is highly partitioned, with a unidirectionally ventilated and immobilized gas-exchanging lung, and fully decoupled, compliant, poorly vascularized ventilatory air-sacs. To understand the evolutionary history of the archosaurian (birds, crocodilians and their common ancestors) respiratory system, it is essential to determine which anatomical characteristics are shared between birds and crocodilians and the role these shared traits play in their respective respiratory biology. To begin to address this larger question, we examined the anatomy of the lung and bronchial tree of ten American alligators (<i>Alligator mississippiensis</i>) and eleven ostriches (<i>Struthio camelus</i>) across an ontogenetic series using traditional and micro-computed tomography (µCT), three-dimensional (3D) digital models, and morphometry. Intraspecific variation and left to right asymmetry were present in certain aspects of the bronchial tree of both taxa but was particularly evident in the cardiac (medial) region of the lungs of alligators and the caudal aspect of the bronchial tree in both species. The cross-sectional area of the primary bronchus at the level of the major secondary airways and cross-sectional area of ostia scaled either isometrically or negatively allometrically in alligators and isometrically or positively allometrically in ostriches with respect to body mass. Of fifteen lung metrics, five were significantly different between the alligator and ostrich, suggesting that these aspects of the lung are more interspecifically plastic in archosaurs. One metric, the distances between the carina and each of the major secondary airways, had minimal intraspecific or ontogenetic variation in both alligators and ostriches, and thus may be a conserved trait in both taxa. In contrast to previous descriptions, the 3D digital models and CT scan data demonstrate that the pulmonary diverticula pneumatize the axial skeleton of the ostrich directly from the gas-exchanging pulmonary tissues instead of the air sacs. Global and specific comparisons between the bronchial topography of the alligator and ostrich reveal multiple possible homologies, suggesting that certain structural aspects of the bronchial tree are likely conserved across Archosauria, and may have been present in the ancestral archosaurian lung.</p>
Anatomy, ontogeny, and evolution of the archosaurian respiratory system: a case study on Alligator mississippiensis and Struthio camelus
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