Embryonic modifications of lacertilian intracranial arteries

✍ Scribed by Burda, Doris J.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1966
• Tongue: English
• Weight: 919 KB
• Volume: 118
• Category: Article
• ISSN: 0002-9106
• DOI: 10.1002/aja.1001180305

✦ Synopsis

Intracranial arteries were studied in Crotaphytus adults and in a series of Lacerta embryos. At an early embryonic period, the mesencephalic artery develops posterior to the bifurcation of the cerebral carotid; as the pontine flexure forms at a subsequent stage, the carotid bifurcation becomes relocated further posteriorly, with the result that the definitive mesencephalic artery becomes an outgrowth of the anterior encephalic artery. Additional significant modifications include the progressive fusion of the two posterior encephalic arteries and the extensive branching of the middle cerebral artery along the lateral regions of the hemisphere. During late stages of development, the circulation to the olfactory region is gradually assumed by extracranial arteries, although remnants of intracranial olfactory arteries may occasionally be retained. 1 A portion of a thesis presented at Harvard University in partial fulfillment of requirements for the Ph.D. degree.

EXPLANATION OF FIGURES

Continuous line, unshaded vessels lie medially and are not visible in lateral view; broken line vessels represent corresponding structures of the opposite side.