Growth of the functional components of the rat skull and its alteration by nutritional effects. A multivariate analysis

American Journal of Physical Anthropology
Héctor M Pucciarelli

Abstract

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 ...Continue Reading

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