Document Detail


Growth of the functional components of the rat skull and its alteration by nutritional effects. A multivariate analysis.
MedLine Citation:
PMID:  7337143     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Weanling male Holtzman rats were subjected to each of the following nutritional treatments: malnutrition-recuperation; undernutrition; and undernutrition-recuperation. The rats were sacrificed when they were 49 days old, and dimensions of each one of the neurocranial, respiratory, and masticatory components were measured. Each component was compared with its counterpart in control rats (21, 28, 35, 42, and 49 day-old) by means of Mahalanobis D2 distances. The same functional components of 49 day-old control skulls were compared with their counterparts in younger control skulls. The means of the chosen cranial dimensions were compared by Tukey tests. Two periods of craniofacial development were identified. In the first, both facial components showed a similar growth that was greater than the neurocranial growth. In the second period, the growth of the masticatory component was greater than that of the respiratory component, which in turn, was greater than that of the neurocranial component. Nutritional deficiencies delayed the growth of the masticatory component more than that of the neurocranial component, which, in turn, was delayed more than that of the respiratory one. About 7% of the dimensions measured were insensitive to both growth and nutrition; 31% were insensitive to nutrition; and 62% were modified by nutrition. Craniofacial development in the rat seems to be a process more complex than what has been generally accepted. A nutritional stress may alter the relative growth between the facial functional components to a greater extent than that between the major functional components; viz. the neurocranium and the splanchnocranium. The cranial dimensions studied were classified according to their sensitivity to growth and/or nutrition into invariable, nutritionally stable, and nutritionally unstable traits.
Authors:
H M Pucciarelli
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of physical anthropology     Volume:  56     ISSN:  0002-9483     ISO Abbreviation:  Am. J. Phys. Anthropol.     Publication Date:  1981 Sep 
Date Detail:
Created Date:  1982-05-21     Completed Date:  1982-05-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0400654     Medline TA:  Am J Phys Anthropol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  33-41     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Cephalometry
Growth Disorders / etiology*
Male
Nutritional Physiological Phenomena*
Rats
Respiratory System / growth & development
Skull / growth & development*
Statistics as Topic

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