LITERATURE REVIEW: COMPARISON BETWEEN THE VERTEBRAL COLUMN OF THE ORCA (ORCINUS ORCA) AND THE HORSE (EQUUS CABALLUS)
The spine is composed of a set of vertebrae, connected by intervertebral discs. It isarticulated through synovial joints present in the articular processes. Because the orca (Orcinus orca) and the horse (Equus caballus) evolved in different habitats, their vertebral formula differs numerically and m...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Brasil |
| Institución: | Faculdades Metropolitanas Unidas (FMU) |
| Repositorio: | Atas de Saúde Ambiental |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs.fmu.br:article/1478 |
| Acceso en línea: | https://revistaseletronicas.fmu.br/index.php/ASA/article/view/1478 |
| Access Level: | acceso abierto |
| Palabra clave: | Anatomy Cetacean Evolution Ungulates Vertebrae. Anatomia Cetáceos Evolução Ungulados Vértebras. |
| Sumario: | The spine is composed of a set of vertebrae, connected by intervertebral discs. It isarticulated through synovial joints present in the articular processes. Because the orca (Orcinus orca) and the horse (Equus caballus) evolved in different habitats, their vertebral formula differs numerically and morphologically. This study aimed to identify and compare morphological differences and adaptive features of the vertebral column of Orcinus orca and Equus caballus. Data was collected through a literature review on number of vertebrae, vertebral shape and morphofunctional adaptive characters for each subject species and related aquatic mammals. According to the literature, both species must have evolved from a single vertebral column morphological model under differential selective environmental pressures. The number of vertebrae per column segment also differs between O. orca and E. caballus, notably because of cervical vertebrae fusion from Atlas to C3 and C4 to C7. Comparing the vertebral formula of Orcinus orca C7, T11-13, L10-12, Ca20-24 = 50-54, and Equuscaballus C7, T18, L6, S5, Ca15-21 = 51-57, clearly corroborates the single model hypothesis. |
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