derived

from the cloaca, which is transformed into the vestibule of the vagina in the female and the urethra in the male. tion of the cavity of the right atrium (auricle) of the heart which receives the blood from the venae cavae it is separa'ted from the rest of the atrium by the crista; terminal is. the four dilatations of the primitive tubular heart; the cavity at the posterior end of the cardiac tube in the embryo, in which the veins from the body unite; in the course of development it forms the termination of the venae cavffi, the portion of the right auricle between the orifices of these ve els, and the coronary sinus, canal of Sohleram or of Lauth, a ring-like vein in the sclera, near its anterior edge, encircling the cornea. venous plexuses lying on the posterior surfaces of the vertebral bodies on either side of the posterior longitudinal ligament.