Abstract
This experiment employed the blood vessel casting method and stylene cracking method to study morphologically blood flow regulation in the vestibule. (I) The results indicate that (1) the arteries have a blood p. mping function, (2) coiled arterioles are involved in blood pressure regulation, (3) the veins function to increase blood pooling. (II) In the utricular macula, an arterio-venous (A-V) anastomosis is present below the capillary plexus. This A-V anastomosis appears to be very important in the regulation of local blood flow.