In the top image, the posterior vagina of a mare tract has been cut open. You can see the vulva to the left side of the image. The second image is an enlargement showing the right hand side. You should be able to identify:

1. Posterior Vagina inner surface
2. Vulva Vaginal Sphincter
3. Openning to Anterior Vagina
4. Urethra

Once you have found these structures, go to the next image to see the structures identified.