High incidence of cervical ribs indicates vulnerable condition in Late Pleistocene woolly rhinoceroses
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چکیده
منابع مشابه
High incidence of cervical ribs indicates vulnerable condition in Late Pleistocene woolly rhinoceroses
Mammals as a rule have seven cervical vertebrae, a number that remains remarkably constant. Changes of this number are associated with major congenital abnormalities (pleiotropic effects) that are, at least in humans, strongly selected against. Recently, it was found that Late Pleistocene mammoths (Mammuthus primigenius) from the North Sea have an unusually high incidence of abnormal cervical v...
متن کاملExtraordinary incidence of cervical ribs indicates vulnerable condition in Late Pleistocene mammoths
The number of cervical vertebrae in mammals is highly conserved at seven. We have shown that changes of this number are selected against due to a coupling with major congenital abnormalities (pleiotropic effects). Here we show that the incidence of abnormal cervical vertebral numbers in Late Pleistocene mammoths from the North Sea is high (33.3%) and approximately 10 times higher than that of e...
متن کاملEvaluation of Neurovascular Complication of Cervical Ribs
Introduction: Cervical rib is relatively uncommon congenital abnormality that originates from the seventh cervical vertebrae and rarely from the sixth vertebrae. The purpose of this paper is to consider that this abnormal condition is an important cause of neurovascular compression at the thoracic outlet. Methods: In this study all patients who were referred to radiology departm...
متن کاملEvaluation of Neurovascular Complication of Cervical Ribs
Received: 05 May 2015 Accepted: 11 Jul. 2015
متن کاملCervical Ribs and Thoracic Outlet Syndrome
Cervical ribs are an anomaly that arise from the lowest cervical vertebrae but their relationship to thoracic outlet syndrome (TOS) is not so constant that the two conditions should be seen as synonymous. Perhaps no more than 10% of people who have cervical ribs develop TOS and the syndrome may well occur in the absence of ribs. Diagnosis of TOS may be difficult and depends upon a thorough hist...
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ژورنال
عنوان ژورنال: PeerJ
سال: 2017
ISSN: 2167-8359
DOI: 10.7717/peerj.3684