VAN 121: Veterinary Gross Anatomy-II (2+2)

BRAIN - CIRCLE OF WILLIS

• The blood supply to the various parts of the brain should be studied now.

Dissection

• With a brain knife slice away the upper part of the cerebrum to the level of the cingular gyrus and with blunt end of the scalpel scrape off the gray matter the cingular gyrus.
• Note a curved band of white matter the cingulum, connecting the frontal and occipital poles of the hemisphere.
• With the blunt end of the scalpel raise the cingulum and expose the corpus callosum, removing away the gray matter on its lateral aspects.
• Study the corpus callosum (refer also to sagittal section of the brain) and the indusium griseum, a thin layer of gray matter with the longitudinal olfactory striae on the dorsal face of the corpus callosum.