Orthocephalization in the postweaning squirrel monkey.
Twenty male squirrel monkeys (Saimiri sciureus boliviensis) raised in captivity were allotted to one of the following groups: weanling control (C6) sampled at 6 months of age; young control (C24) fed ad libitum on a control diet and killed at 24 months of age; and malnourished (M24) fed ad libitum on a low-protein diet and sampled at 24 months of age. Cranial points and the lateral semicircular canals were marked. On each skull, a strict lateral teleradiograph was taken, and the lengths of the midsagittal chords and their angles with respect to the vestibular line were measured. Age changed the lengths in about 70% of the chords and more than 50% of the angles. Malnutrition arrested about 50% of the lengths, but the angles were practically not affected. It is concluded that the postweaning Saimiri sciureus undergoes orthocephalization according to a general pattern already observed in rodents and suggested for pongids. Postweaning malnutrition affected growth in size but not shape changes related to the orthocephalization of the Saimiri skull.
Pucciarelli
H M
HM
CIGEBA (Centro de Investigaciones en Genética Básica y Aplicada), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Buenos Aires, Argentina.
Dressino
V
V
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002508:Cephalometry; D004044:Dietary Proteins / Q000008:administration & dosage; D008297:Male; D009748:Nutrition Disorders / Q000503:physiopathology*; D012453:Saimiri; D012886:Skull / Q000033:anatomy & histology / Q000254:growth & development*
D004044:Dietary Proteins