Journal of Mammalian Evolution

, Volume 12, Issue 1–2, pp 195–207 | Cite as

Anatomy of the Cranial Endocast of the Bottlenose Dolphin, Tursiops truncatus, Based on HRXCT

  • Matthew W. Colbert
  • Rachel Racicot
  • Timothy Rowe
Article

Abstract

Endocranial surfaces, volumes, and interconnectivities of extant and fossil odontocetes potentially offer information on the general architecture of the brain and on the structure of the specialized cetacean circulatory system. Although conventional methods for acquiring such data have generally involved invasive preparation of the specimen, particularly in the case of fossils, new tomographic technologies afford nondestructive access to these internal morphologies. In this study we used high-resolution X-ray computed tomography (HRXCT) to scan a skull of the extant Tursiops truncatus (Cetacea: Odontoceti). We processed the data to reveal the cranial endocast and details of internal skeletal architecture (data at www.digimorph.org). Major features that can be discerned include aspects of the specimen's hypertrophied retia mirabilia, the major canals and openings of the cranial cavity, and the relationship of the brain and endocranial circulatory structures to the surrounding skeleton. CT data also provide information on the shape of the brain that may be lost in conventional anatomical preparations, and readily provide volumetric and linear measurements of the endocast and its individual segments. These results demonstrate the utility of HRXCT for interpreting the internal cranial anatomy of both extant and fossil cetaceans.

Keywords

Tursiops endocast computed tomography 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Matthew W. Colbert
    • 1
    • 4
  • Rachel Racicot
    • 1
    • 3
  • Timothy Rowe
    • 1
    • 2
  1. 1.Jackson School of GeosciencesThe University of Texas at AustinAustinUSA
  2. 2.Texas Memorial MuseumThe University of Texas at AustinAustinUSA
  3. 3.Biology DepartmentSan Diego State UniversitySan DiegoUSA
  4. 4.Geological Science DepartmentAustinUSA

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