The microsurgical anatomy of the premamillary artery

J Clin Neurosci. 2001 May;8(3):256-60. doi: 10.1054/jocn.2000.0822.


The 50 premamillary arteries (PremA), arising from 39 posterior communicating arteries (PCoA), were examined in injected human brains. The PremA, which commonly was single (71.8%) and less frequently double (28.2%), more often arose from the PCoA (97.4% ) than from the posterior cerebralartery (PCA) (2.6%). The PremA ranged between 280 and 780 microm in diameter. It gave off side branches to the hypothalamus (23.1%), optic tract (10.2%), mamillary body (17.9%) and the crus cerebri (35.9%). The anastomoses involving the extracerebral segment of the PremA were present in 35.9% of the cases. They varied in caliber from 50 to 230 microm. The intracerebral segment of the PremA ranged from 280 to 490 microm in diameter. Our study gives a precise anatomic basis for safer operations on the aneurysms of the posterior communicating artery and adjacent vessels.

MeSH terms

  • Circle of Willis / anatomy & histology*
  • Circle of Willis / surgery*
  • Corrosion Casting
  • Humans
  • Mammillary Bodies
  • Thalamus / blood supply*