This model facilities the medical students to get a correct understanding of the external features of the brain and its aterial supply as a whole, as well as the relationgs between their component portions. External features of the brain: cerebral hemisphere,brain,stem,cerebellum. the aterial supply of the brain:sources, vertebral, internal carotid ateries, arteria supply of the cerebellum and cerebrum. Made of PVC and can be separated into 7 parts. on base.