. Chordate anatomy. Chordata; Anatomy, Comparative. 3IO CHORDATE ANATOMY partially surrounds the ovary. The margin of this opening is prolonged into numerous fimbriae which surround the ovary and convey the ova into the uterine tube. A ciliated columnar epithehum lines the tubes, the cilia beating towards the uterus and carrying the ova in that direction. The number of ciUa is greatly increased by the complex folding of the Uning of the tubes. The blood supply of the tubes comes from ovarian and uterine vessels. The nerves are sympathetic. (Fig. 275) The Uterus. The uterus is a median pear-sha
. Chordate anatomy. Chordata; Anatomy, Comparative. 3IO CHORDATE ANATOMY partially surrounds the ovary. The margin of this opening is prolonged into numerous fimbriae which surround the ovary and convey the ova into the uterine tube. A ciliated columnar epithehum lines the tubes, the cilia beating towards the uterus and carrying the ova in that direction. The number of ciUa is greatly increased by the complex folding of the Uning of the tubes. The blood supply of the tubes comes from ovarian and uterine vessels. The nerves are sympathetic. (Fig. 275) The Uterus. The uterus is a median pear-shaped organ suspended in the broad ligament. Round and ovarian ligaments form additional supports. The body of the uterus is normally bent forward so that it rests upon the bladder. By a constriction, the isthmus, the uterus is NUCLLAR DIVISION IMPLANTATION. FERTILIZATION COMPLETE UNION OF PRONUCLEI -CORPUS LUTEUM UTERINE TUBE SPERMATOZOON OVULATION 1ST POLAR BOCrV STAGE UTERINE GLANDS Fig. 275.—Diagram illustrating the passage of the fertilized egg from the ovary to the uterus. The ovum is a week in the tube and three days in the uterus before implanta- tion takes place. (Redrawn after Dickinson's " Sex Anatomy," Williams & Wilkins Co.) divided into an upper body and a lower cervix. Its cavity is connected with that of the vagina below and those of the paired uterine tubes above. The cavity of the uterus is lined with a simple cihated columnar epithehum, from which numerous tubular glands of unknown function grow down into the underlying connective tissue. This mucous hning, the endometrium, is partly lost during menstruation, with some extravasa- tion of blood. The thick muscular wall of the uterus consists of inter- woven masses of smooth muscle fibers. Uterine and ovarian vessels pro\nde the blood supply. The nerve supply is sympathetic. The Vagina. The vagina provides the outlet of the reproductive apparatus. It is a highly distensible muscular canal between
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