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Text
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URL Address
<a href="http://doi.org/10.7717/peerj.1696" target="_blank" rel="noreferrer noopener">http://doi.org/10.7717/peerj.1696</a>
Pages
e1696–e1696
Volume
4
Dublin Core
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Title
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A comparison of postnatal arterial patterns in a growth series of giraffe (Artiodactyla: Giraffa camelopardalis).
Publisher
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PeerJ
Date
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2016
1905-07
Subject
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Anatomical imaging; Arterial development; Artiodactyla; Carotid rete; CT scan; Giraffa camelopardalis; Ontogeny; Ruminant
Creator
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O'Brien Haley D; Gignac Paul M; Hieronymus Tobin L; Witmer Lawrence M
Description
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Nearly all living artiodactyls (even-toed ungulates) possess a derived cranial arterial pattern that is highly distinctive from most other mammals. Foremost among a suite of atypical arterial configurations is the functional and anatomical replacement of the internal carotid artery with an extensive, subdural arterial meshwork called the carotid rete. This interdigitating network branches from the maxillary artery and is housed within the cavernous venous sinus. As the cavernous sinus receives cooled blood draining from the nasal mucosa, heat rapidly dissipates across the high surface area of the rete to be carried away from the brain by the venous system. This combination yields one of the most effective mechanisms of selective brain cooling. Although arterial development begins from the same embryonic scaffolding typical of mammals, possession of a rete is typically accompanied by obliteration of the internal carotid artery. Among taxa with available ontogenetic data, the point at which the internal carotid obliterates is variable throughout development. In small-bodied artiodactyls, the internal carotid typically obliterates prior to parturition, but in larger species, the vessel may remain patent for several years. In this study, we use digital anatomical data collection methods to describe the cranial arterial patterns for a growth series of giraffe (Giraffa camelopardalis), from parturition to senescence. Giraffes, in particular, have unique cardiovascular demands and adaptations owing to their exceptional body form and may not adhere to previously documented stages of cranial arterial development. We find the carotid arterial system to be conserved between developmental stages and that obliteration of the giraffe internal carotid artery occurs prior to parturition.
Identifier
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<a href="http://doi.org/10.7717/peerj.1696" target="_blank" rel="noreferrer noopener">10.7717/peerj.1696</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
2016
Anatomical imaging
Arterial development
Artiodactyla
Carotid rete
CT scan
Department of Anatomy & Neurobiology
Gignac Paul M
Giraffa camelopardalis
Hieronymus Tobin L
NEOMED College of Medicine
O'Brien Haley D
ontogeny
PeerJ
Ruminant
Witmer Lawrence M