Comparative study of arterial vascularization of the amygdaloid body in man and sheep.

The aim of this study was anatomical and comparative examination of vascular sources and angioarchitecture of the amygdaloid body in adult man and sheep. The studies were carried out using own injection method. The cerebral arteries filled with synthetic many-colored latex were dissected under an operating microscope. It was found that the main source of vascularization of the amygdaloid body, both in the human and sheep brains, is formed by 1-3 branches originating from the proximal segment of the middle cerebral artery. The supplementary sources are singular small branches of the anterior choroidal artery. Each of these arborescent arterioles distributes and supplies only the amygdaloid body and does not penetrate into the surrounding white matter. Their courses and topography do not create anatomical conditions for collateral circulation. Obtained results indicate also that the amygdaloid body, as a unit structure of the cerebral gray matter, possesses its own, separate and well developed arterial system.