Studies on orthocephalization. VII. Behavior of the rat cranial frame in the period between 1 day before birth to 14 days after birth.
The positional stability of the zygomatic arch of the rat skull in relation to the parietal bone, the basisphenoid bone and the length axis of the skull, as previously demonstrated in rats older than 14 days, does not exist to the same degree in younger rats. These conclusions have been drawn from a study of a sample of rats, aged 0, 4, 7 and 14 days. These 4 groups of rats have been x-rayed after sacrifice, and from the x-ray photographs, quantitative expressions of angular values between the mentioned structures have been obtained. The most important result is, however, considered to be, that a full description of the behavior of the external cranial frame of the rat skull is now available for further studies on the process of orthocephalization.
D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D002508:Cephalometry; D005147:Facial Bones / Q000033:anatomy & histology; D005260:Female; D008297:Male; D010294:Parietal Bone / Q000033:anatomy & histology; D051381:Rats / Q000033:anatomy & histology*; D012886:Skull / Q000033:anatomy & histology / Q000254:growth & development*