| Functional morphology of the nasal region of a hammerhead shark. | |
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MedLine Citation:
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PMID: 19883784 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We describe several novel morphological features in the nasal region of the hammerhead shark Sphyrna tudes. Unlike the open, rounded incurrent nostril of non-hammerhead shark species, the incurrent nostril of S. tudes is a thin keyhole-like aperture. We discovered a groove running anterior and parallel to the incurrent nostril. This groove, dubbed the minor nasal groove to distinguish it from the larger, previously described, (major) nasal groove, is common to all eight hammerhead species. Using life-sized plastic models generated at 200 microm resolution from an X-ray scan, we also investigated flow in the nasal region. Even modest oncoming flow speeds stimulate extensive, but not complete, circulation within the model olfactory chamber, with flow passing through the two main olfactory channels. Flow crossed from one channel to another via a gap in the olfactory array, sometimes guided by the interlamellar channels. Major and minor nasal grooves, as well as directing flow into the olfactory chamber, can, in conjunction with the nasal bridge separating incurrent and excurrent nostrils, limit flow passing into the olfactory chamber, possibly to protect the delicate nasal structures. This is the first simulation of internal flow within the olfactory chamber of a shark. |
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Authors:
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Richard L Abel; James S Maclaine; Ross Cotton; Viet Bui Xuan; Timothy B Nickels; Thomas H Clark; Zhijin Wang; Jonathan P L Cox |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-10-31 |
Journal Detail:
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Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: 155 ISSN: 1531-4332 ISO Abbreviation: Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-11 Completed Date: 2010-06-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 464-75 Citation Subset: IM |
Affiliation:
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Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Models, Anatomic Nose / anatomy & histology*, physiology*, radiography Olfactory Pathways / anatomy & histology, physiology Pulmonary Ventilation Rheology Sharks / anatomy & histology*, physiology* Smell* Swimming Video Recording X-Ray Microtomography |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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