The vagina is a muscular tube. The lining epithelium is stratified squamous (why do you think this is?)
Underneath the epithelium is a layer of lamina propria, which is rich in elastic fibres, and does not have any glands.
Under the lamina propria layer is a layer of smooth muscle, which has an inner circular and outer longitudinal layer.
Finally, there is an adventitial layer, which merges with that of the bladder (anteriorly) and rectum (posteriorly).
Can you recognise the epithelium, lamina propria and smooth muscle layer on this photograph?
The elastic LP and smooth muscle enable the vagina to distend, particularly during birth.