Pecten of the chick eye demonstrated by vascular casts.

Vascular casts demonstrated the capillary network and characteristic features of the inner surface of the capillaries in the chick pecten oculi. Pecten capillaries anastomosed free with each other to form a complicated network of many layers of capillaries. The capillary diameter varied from capillary to capillary, and sometimes ampulla-like features were seen. Numerous pores in the casts of the capillaries corresponded to endothelial processes. Pits represented of nuclear imprints. These scanning electron microscopic findings in vascular casts were not incompatible with those seen by transmission electron microscopy.