The exoskeleton is further strengthened by the addition of calcium carbonate in organisms such as the lobster. ![]() ![]() Chitin is secreted by the epidermal cells. Arthropods such as crabs and lobsters have exoskeletons that consist of 30–50 percent chitin, a polysaccharide derivative of glucose that is a strong but flexible material. Shortening of the muscle changes the relationship of the two segments of the exoskeleton. As with vertebrates, muscles must cross a joint inside the exoskeleton. This skeleton type provides defence against predators, supports the body, and allows for movement through the contraction of attached muscles. For example, the shells of crabs and insects are exoskeletons (Figure 19.3). Finger fractures.An exoskeleton is an external skeleton that consists of a hard encasement on the surface of an organism. What is bone?.Īmerican Academy of Orthopaedic Surgeons. National Institute of Arthritis and Musculoskeletal and Skin Diseases. Human biological variation in sesamoid bone prevalence: the curious case of the fabella. Hiding within the cracks: case report of rare sutural bone found at the nasion. Structure of bone tissue.Įdwards B, Wang JM, Iwanaga J, et al. Classifications in brief: Salter-Harris classification of pediatric physeal fractures. doi:10.3390/healthcare10020367Ĭepela DJ, Tartaglione JP, Dooley TP, Patel PN. Clinical management of intraosseous access in adults in critical situations for health professionals. ![]() Classification of bones.Īstasio-Picado Á, Cobos-Moreno P, Gómez-Martín B, Zabala-Baños MDC, Aranda-Martín C.
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